FINAL TERM Flashcards

(140 cards)

1
Q

Class of Protein

A

Structural, Contractile, Transport, Storage, Hormone, Enzyme, and Protection

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2
Q

Class of Protein that regulate body metabolism and nervous system

A

Hormone

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3
Q

Class of protein that catalyze biochemical reactions in the cells

A

Enzyme

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4
Q

Class of protein that recognizes and destroy foreign substances

A

Protection

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5
Q

-are the building blocks of proteins
-contain a carboxylic acid group and an amino group
-on the alpha (α) carbon
-are ionized in solution
-each contains a different side group (R)

A

Amino acids

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6
Q

Types of Amino acids

A

Polar, nonpolar, acidic, and basic

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7
Q

Type of amino acids with hydrocarbon
side chains (hydrophobic)
-has an R group that is H, an
alkyl group, or aromatic.

A

Nonpolar

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8
Q

Type of amino acids with polar
or ionic side chains
(hydrophilic)
-has an R group that is alcohol,
thiol, or amide.

A

Polar (neutral)

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9
Q

Type of amino acids with
–NH2 side chains
(hydrophilic)
-with an amino R group (NH3+)

A

Basic

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10
Q

-are chiral except glycine, which has two H atoms
-attached to the alpha carbon atom
-have Fischer projections that are stereoisomers
-that are L isomers are used in proteins

A

Amino acids

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11
Q

-has an equal number of —NH3+ and COO– groups
-forms when the H from —COOH in an amino acid
transfers to the —NH2

A

Zwitterion

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12
Q

-are the pH at which zwitterions
have an overall zero charge
-of nonpolar and polar (neutral)
amino acids exist at pH values
from 5.1 to 6.3

A

Isoelectric points (pI)

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13
Q

the zwitterion accepts a proton
(H) to form a positively charged ion.

A

Acidic solution

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14
Q

-In solutions that are more acidic than the pI,
-the COO– in the zwitterion accepts a proton
-the amino acid has a positive charge

A

Zwitterions in Acidic solutions

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15
Q

-In solutions that are more basic than the pI,
-the NH3+ in the zwitterion loses a proton
-the amino acid has a negative charge

A

Zwitterions in basic solutions

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16
Q

the -NH3+ of the zwitterion loses a
proton, and a negatively charged species is formed.

A

Basic solution

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17
Q

-a polar (acidic) amino acid,
-has a pI of 2.8
-forms a zwitterion at pH 2.8
-forms negative ions with charges 1– and 2– at pH
values greater than pH 2.8

A

Aspartic acid

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18
Q

-an electric current is used to
separate a mixture of amino acids, and
-the positively charged amino acids move toward the
negative electrode
-the negatively charged amino acids move toward the
positive electrode
-an amino acid at its pI does not migrate
-the amino acids are identified as separate bands on the
filter paper or thin layer plate

A

Electrophoresis

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19
Q

-is an amide bond
-forms between the carboxyl group of one amino acid
and the amino group of the next amino acid
-contains an N (free H3N+) terminal written on the left
-contains a C (free COO –) terminal written on the right

A

Peptide bond

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20
Q

-a yl ending for the N-terminal (free H3N+) amino acid
-the full amino acid name of the free carboxyl group
(COO–) at the C-terminal end

A

Dipeptide

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21
Q

The primary structure of a protein is

A

-the particular sequence of amino acids
-the backbone of a peptide chain or protein

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22
Q

-have similar primary structures
-differ only in the amino acids at positions 3 and 8

A

Nonapeptides oxytocin and vasopressin

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23
Q

-was the first protein to have
its primary structure
determined
-has a primary structure of
two polypeptide chains
linked by disulfide bonds
-has an A chain with 21
amino acids and a B chain
with 30 amino acids

A

Insulin

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24
Q

-a coiled shape held in place by hydrogen bonds
between the amide groups and the carbonyl groups
of the amino acids along the chain
-hydrogen bonds between the H of an —NH group
and the O of C═O of the fourth amino acid down
the chain

A

Alpha helix (α-helix)

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25
is a secondary structure that consists of polypeptide chains arranged side by side -has hydrogen bonds between chains -has R groups above and below the sheet -is typical of fibrous proteins such as silk
Beta-pleated sheet (β-pleated sheet)
26
-consists of three alpha helix chains woven together -contains large amounts of glycine, proline, hydroxyproline, and hydroxylysine that contain –OH groups for hydrogen bonding -is found in collagen, connective tissue, skin, tendons, and cartilage
Triple helix
27
are the ten amino acids not synthesized by the body must be obtained from the diet are in meat and diary products are missing (one or more) in grains and vegetables
Essential amino acids
28
gives a specific three-dimensional shape to the polypeptide chain involves interactions and cross-links between different parts of the peptide chain is stabilized by: hydrophobic and hydrophilic interactions salt bridges hydrogen bonds disulfide bonds
Tertiary structure
29
Interactions between nonpolar groups
Hydrophobic interactions
30
Attraction between polar and ionized groups and water on the surface of the tertiary structure
Hydrophilic interactions
31
Ionic interactions between ionized acidic and basic amino acids
Salt bridges
32
Occur between H and O or N
Hydrogen bonds
33
Strong covalent links between sulfur atoms of two cysteine amino acids
Disulfide bonds
34
have compact, spherical shapes carry out synthesis, transport, and metabolism in the cells such as myoglobin store and transport oxygen in muscle
Globular proteins
35
consist of long, fiber-like shapes such as alpha keratins make up hair, wool, skin, and nails such as feathers contain beta keratins with large amounts of beta-pleated sheet structures
Fibrous proteins
36
is the combination of two or more tertiary units is stabilized by the same interactions found in tertiary structures of hemoglobin consists of two alpha chains and two beta chains with heme groups in each subunit that pick up oxygen for transport in the blood to the tissues
Quaternary structure
37
splits the peptide bonds to give smaller peptides and amino acids occurs in the digestion of proteins occurs in cells when amino acids are needed to synthesize new proteins and repair tissues
Protein hydrolysis
38
the disruption of bonds in the secondary, tertiary, and quaternary protein structures heat and organic compounds that break apart H bonds and disrupt hydrophobic interactions acids and bases that break H bonds between polar R groups and disrupt ionic bonds heavy metal ions that react with S—S bonds to form solids agitation, such as whipping, that stretches peptide chains until bonds break
Denaturation
39
an egg is cooked the skin is wiped with alcohol heat is used to cauterize blood vessels instruments are sterilized in an autoclave
Denaturation
40
are proteins that catalyze nearly all the chemical reactions taking place in the cells of the body increase the rate of reaction by lowering the energy of activation
Enzymes
41
Classification of enzymes
Oxidoreductases Transferases Hydrolases Lyases Isomerases Ligases
42
Add or remove groups without hydrolysis or oxidation that may result in a double bond
Lyases
43
Join molecules using ATP energy
Ligases
44
is a region within an enzyme that fits the shape of the reacting molecule, called a substrate contains amino acid R groups that bind the substrate releases products when the reaction is complete
Active site
45
a substrate attaches to the active site an enzyme–substrate (ES) complex forms reaction occurs and products are released an enzyme (E) is used over and over
enzyme-catalyzed reaction
46
Enzymes may recognize and catalyze a single substrate a group of similar substrates a particular type of bond
Enzyme specificity
47
Catalyze one type of reaction for a single substrate
Absolute
48
Catalyze one type of reaction for similar substrates
Group
49
Catalyze one type of reaction for a specific type of bond
Linkage
50
the active site has a rigid shape only substrates with the matching shape can fit the substrate is the key that fits that lock
Lock-and-key model
51
enzyme structure is flexible, not rigid shapes of enzyme and substrate adjust for best fit at the active site to improve catalysis of reaction substrate specificity increases
Induced-fit model
52
The active site is 1) the entire enzyme 2) a section of the enzyme 3) the substrate
2
53
In the induced-fit model, the shape of the enzyme when substrate binds 1) stays the same 2) adapts to the shape of the substrate
2
54
catalyze the same reaction in different tissues in the body can be used to identify the organ or tissue involved in damage or disease such as LDH have one form more prevalent in heart muscle and another form in skeletal muscle and liver tissue
Isoenzymes
55
determine the amount of damage in tissues that are elevated may indicate damage or disease in a particular organ
Diagnostic enzymes
56
are most active at an optimum temperature (usually 37°C in humans) show little activity at low temperatures lose activity at high temperatures as denaturation occurs
enzymes
57
Enzymes in the body have an optimum pH of about
7.4
58
are molecules that cause a loss of catalytic activity prevent substrates from fitting into the active sites
Inhibitors
59
Types of Inhibition
Reversible and Irreversible
60
Types of Reversible Inhibition
Competitive and noncompetitive
61
has a structure that is similar to that of the substrate competes with the substrate for the active site has its effect reversed by increasing substrate concentration
Competitive inhibitor
62
has a structure that is much different than the substrate distorts the shape of the enzyme, which alters the shape of the active site prevents the binding of the substrate cannot have its effect reversed by adding more substrate
Noncompetitive inhibitor
63
A molecule that forms a covalent bond to a part of the active site, permanently preventing substrates from occupying ir.
Irreversible Enzyme Inhibitor
64
is a competitive inhibitor of succinate dehydrogenase has a structure that is similar to succinate inhibition is reversed by adding succinate
Malonate
65
Identify each description as an inhibitor that is 1) competitive or 2) noncompetitive. A. increasing substrate reverses inhibition B. binds to enzyme surface but not to the active site C. structure is similar to substrate D. inhibition is not reversed by adding more substrate
Identify each description as an inhibitor that is 1) competitive or 2) noncompetitive. 1 A. increasing substrate reverses inhibition 2 B. binds to enzyme surface but not to the active site 1 C. structure is similar to substrate 2 D. inhibition is not reversed by adding more substrate
66
are inactive forms of enzymes are activated when one or more peptides are removed
Zymogens
67
produced as zymogens in one organ and transported to another, such as the pancreas, when needed activated by removing small peptide sections
Digestive enzymes
68
an enzyme in a reaction sequence that binds a regulator substance
Allosteric enzyme
69
when it enhances the binding of substrate and accelerates the rate of reaction
Positive regulator
70
when it prevents the binding of the substrate to the active site and slows down the rate of reaction
Negative regulator
71
a product acts as a regulator an end product binds with the first enzyme (E1) in a sequence when sufficient product is present so shuts down the reaction
Feedback control
72
it binds to threonine deaminase, the first enzyme in the pathway from threonine to isoleucine a change in the shape of threonine deaminase blocks the binding of threonine
Isoleucine
73
is an active enzyme that consists only of protein.
Simple enzyme
74
is a cofactor that is a small organic molecule such as a vitamin.
coenzyme
75
Identify each enzyme as 1) a simple enzyme 2) an enzyme that required a cofactor A. requires Mg2+ for hydrolysis of phosphate esters B. requires vitamin B3 to transfer an acetyl group C. is active with four polypeptide subunits
Identify each enzyme as 1) a simple enzyme 2) an enzyme that required a cofactor 2 A. requires Mg2+ for hydrolysis of phosphate esters 2 B. requires vitamin B3 to transfer an acetyl group 1 C. is active with four polypeptide subunits
76
soluble in aqueous solutions cofactors for many enzymes not stored in the body
water-soluble vitamins
77
was the first B vitamin identified is part of the coenzyme thiamin pyrophosphate (TPP) is used to decarboxylate α-keto carboxylic acids has a recommended daily allowance (RDA) of 1.2 mg; deficiencies include fatigue, poor appetite, weight loss, nerve degeneration, and heart failure
Thiamin (Vitamin B1)
78
is found in the coenzymes flavin adenine dinucleotide (FAD) and flavin mononucleotide (FMN) is needed for good vision and healthy skin has an RDA of 1.2–1.8 mg; deficiencies include dermatitis, dry skin, tongue inflammation, and cataracts
Riboflavin (Vitamin B2)
79
is part of the coenzyme nicotinamide adenine dinucleotide (NAD+) involved in oxidation–reduction reactions has an RDA of 14–18 mg deficiency can result in dermatitis, muscle fatigue, and loss of appetite
Niacin (Vitamin B3)
80
is part of coenzyme A needed for energy production is involved in glucose and cholesterol synthesis has an RDA of 5 mg deficiency can result in fatigue, retarded growth, cramps, and anemia
Pantothenic acid (Vitamin B5)
81
two forms of vitamin B6, which are converted to the coenzyme pyridoxal phosphate (PLP) required in the transamination of amino acids and decarboxylation of carboxylic acids has an RDA of 1.3–2.0 mg; deficiency may lead to dermatitis, fatigue, and anemia
Pyridoxine and pyridoxal
82
consists of four pyrrole rings with a Co2+ is a coenzyme for enzymes that transfer methyl groups and produce red blood cells has an RDA of 2.0–2.6 μg deficiencies are pernicious anemia, nerve damage, and malformed red blood cells
Cobalamin (Vitamin B12)
83
is required in collagen synthesis and healing of wounds has an RDA of 60–95 mg deficiencies are scurvy, weakened connective tissue, slow-healing wounds, and anemia
Ascorbic acid (Vitamin C)
84
is a coenzyme for enzymes that transfer carboxyl groups has an RDA of 30 μg deficiencies include dermatitis, loss of hair, fatigue, and anemia
Biotin
85
consists of pyrimidine, p-aminobenzoic acid, and glutamate forms the coenzyme THF used in the transfer of methyl groups and is involved in the synthesis of nucleic acids has an RDA of 400 μg deficiencies are abnormal red blood cells, anemia, and poor growth
Folic acid (Folate)
86
vitamins A, D, E, and K soluble in lipids but not in aqueous solutions stored in the body important in vision, bone formation, antioxidants, and blood clotting
Fat-soluble vitamins
87
is needed for retinol (vision); synthesis of RNA has an RDA of 800 μg deficiencies include night blindness, immune system repression, and slowed growth
Retinol (Vitamin A)
88
is synthesized in skin exposed to sunlight regulates the absorption of phosphorus and calcium during bone growth has an RDA of 5–10 μg deficiency includes weakened bones
Cholecalciferol (Vitamin D)
89
is an antioxidant in cells may prevent the oxidation of unsaturated fatty acids is found in whole grains and vegetables has an RDA of 15 mg deficiencies are hemolysis and anemia
Tocopherol (Vitamin E)
90
Vitamin K1 in plants has a saturated side chain. Vitamin K2 in animals has a long unsaturated side chain. Vitamin K2 is needed for the synthesis of zymogens for blood clotting. Vitamin K has an RDA of 90–120 μg. Deficiencies are prolonged bleeding time and bruising
Menaquinon (Vitamin K)
91
Identify each of the following as a water-soluble vitamin (WS) or fat-soluble vitamin (FS). A. folic acid B. retinol (vitamin A) C. vitamin C D. vitamin E E. niacin
Identify each of the following as a water-soluble vitamin (WS) or fat-soluble vitamin (FS) WS A. folic acid FS B. retinol (vitamin A) WS C. vitamin C FS D. vitamin E WS E. niacin
92
Identify the vitamin associated with each 1) riboflavin (B2) 2) vitamin A 3) vitamin K 4) vitamin D 5) ascorbic acid A. collagen formation B. part of the coenzymes FAD and FMN C. absorption of phosphorus and calcium in bone D. vision E. blood clotting
Identify the vitamin associated with each 1) riboflavin (B2) 2) vitamin A 3) vitamin K 4) vitamin D 5) ascorbic acid 5 A. collagen formation 1 B. part of the coenzymes FAD and FMN 4 C.absorption of phosphorus and calcium in bone 2 D. vision 3 E. blood clotting
93
molecules that store information for cellular growth and reproduction deoxyribonucleic acid (DNA) and ribonucleic acid (RNA)
Nucleic acids
94
large molecules consisting of long chains of monomers called
nucleotides
95
Nucleotides are consist of
base with nitrogen pentose sugar phosphoryl group
96
The bases in DNA and RNA are
pyrimidines C, T, and U purines A and G
97
in RNA is ribose in DNA is deoxyribose, with no O atom on carbon 2′ has carbon atoms numbered with primes to distinguish them from the atoms in the bases
Pentose sugar
98
has a base linked by a glycosidic bond to C1′ of a sugar (ribose or deoxyribose) is named by changing the end of the base name to osine for purines and idine for pyrimidines
nucleoside
99
has a phosphoryl group attached to the C5′ —OH group of a nucleoside is named using the name of the nucleoside followed by -5′-monophosphate
nucleotide
100
nucleotides are joined by phosphodiester bonds the 3′ —OH group of the sugar in one nucleotide forms an ester bond to the phosphate group on the 5′ carbon of the sugar of the next nucleotide
Primary structure of nucleic acids
101
has a free 5′-phosphate group at one end and a free 3′ —OH group at the other end is read from the free 5′ end, using the letters of the bases segment shown here is read as: 5′—A—C—G—T—3′
nucleic acid polymer
102
is a single strand of nucleotides consists of the bases A, C, G, and U linked by 3′—5′ ester bonds between ribose and phosphate
Primary structure of RNA
103
the percentage of adenine (A) is the same as the percentage of
Thymine
104
the percentage of guanine (G) is the same as the percentage of
Cytosine
105
Adenine is always linked by ____ hydrogen bonds to thymine (A−T)
two
106
guanine is always linked by ______ hydrogen bonds to cytosine (G−C)
Three
107
consists of two strands of nucleotides that form a double helix structure like a spiral stair case has hydrogen bonds between the bases A–T and G–C has bases along one strand that complement the bases along the other
Double helix
108
involves unwinding the DNA pairing the bases in each strand with new bases to form new complementary strands producing two new DNA strands that exactly duplicate the original DNA
DNA replication
109
from the hydrolysis of each nucleoside triphosphate is used to form a phosphodiester bond to each new nucleotide on the complementary strand
Hydrolysis energy
110
at each open DNA section (called a __________), DNA polymerase catalyzes the formation of 5′–3′ ester bonds of the leading strand
Replication fork
111
the lagging strand (growing in the 3′–5′ direction) is synthesized in short sections called
Okazaki fragments
112
Match the following: 1) helicase 2) DNA polymerase 3) replication fork 4) Okazaki fragments A. short segments formed by the lagging strand B. the starting point for synthesis in unwound DNA sections C. the enzyme that unwinds the DNA double helix D. the enzyme that catalyzes the formation of phosphodiester bonds of complementary bases
Match the following: 1) helicase 2) DNA polymerase 3) replication fork 4) Okazaki fragments 4 A. Short segments formed by the lagging strand. 3 B. The starting point for synthesis in unwound DNA sections. 1 C. The enzyme that unwinds the DNA double helix 2 D. The enzyme that catalyzes the formation of phosphodiester bonds of complementary bases
113
transmits information from DNA to make proteins
RNA
114
carries genetic information from DNA to the ribosomes.
Messenger RNA (mRNA)
115
brings amino acids to the ribosome to make the protein.
Transfer RNA (tRNA)
116
makes up 2/3 of ribosomes where protein synthesis takes place.
Ribosomal RNA (rRNA)
117
mRNA is formed from a gene on a DNA strand
Transcription
118
tRNA molecules bring amino acids to mRNA to build a protein
Translation
119
moves along the DNA template in the 3′–5′ direction to synthesize the corresponding mRNA the mRNA is released at the termination point
RNA polymerase
120
DNA contains _______ that code for proteins and _______ that do not code for proteins
exons, introns
121
in which the end products speed up or slow the synthesis of mRNA
Feedback control
122
in which high levels of a reactant induce the transcription process to provide the necessary enzymes for that reactant
Enzyme induction
123
consists of a control site and structural genes that produce mRNA for lactose enzymes.
lactose operon
124
is a sequence of nitrogenous bases in an mRNA that determines the amino acid order for the protein consists of sets of three bases (triplets) along the mRNA called codons has a different codon for all 20 amino acids needed to build a protein contains codons that signal the “start” and “end” of a polypeptide chain
Genetic code
125
occurs when a synthetase uses energy from ATP hydrolysis to attach an amino acid to a specific tRNA prepares each tRNA to use a triplet called an anticodon to complement a codon on mRNA
activation of tRNA
126
an mRNA attaches to a ribosome the start codon (AUG) binds to a tRNA with methionine the second codon attaches to a tRNA with the next amino acid a peptide bond forms between the adjacent amino acids at the first and second codons
Initiation
127
the first tRNA detaches from the ribosome the ribosome shifts to the adjacent codon on the mRNA a new tRNA/amino acid attaches to the open binding site a peptide bond forms, and the empty tRNA detaches the ribosome shifts down the mRNA to read the next codon
Translocation
128
a polypeptide with all the amino acids for a protein is synthesized the ribosome reaches a “stop” codon: UGA, UAA, or UAG there is no tRNA with an anticodon for the “stop” codons the polypeptide detaches from the ribosome
Termination
129
Match the following: 1) activation 2) initiation 3) translocation 4) termination A. Ribosomes move along mRNA, adding amino acids to a growing peptide chain. B. A completed peptide chain is released. C. A tRNA attaches to its specific amino acid. D. A tRNA binds to the AUG codon of the mRNA on the ribosome.
Match the following: 1) activation 2) initiation 3) translocation 4) termination 3 A. Ribosomes move along mRNA, adding amino acids to a growing peptide chain. 4 B. A completed peptide chain is released. 1 C. A tRNA attaches to its specific amino acid. 2 D. A tRNA binds to the AUG codon of the mRNA on the ribosome.
130
alters the nucleotide sequence in DNA results from mutagens such as radiation and chemicals produces one or more incorrect codons in the corresponding mRNA produces a protein that incorporates one or more incorrect amino acids causes genetic diseases that produce defective proteins and enzymes
Mutation
131
a different base substitutes for the proper base in DNA there is a change in a codon in the mRNA the wrong amino acid may be placed in the polypeptide
Substitution mutation
132
an extra base adds to or is deleted from the normal DNA sequence the codons in mRNA and the amino acids are incorrect from the base change
Frame shift mutation
133
Identify each type of mutation as a substitution (S) or frame shift (F). A. Cytosine (C) enters the DNA sequence. B. One adenosine is removed from the DNA sequence. C. A base sequence of TGA in DNA changes to TAA.
Identify each type of mutation as a substitution (S) or frame shift (F). F A. Cytosine (C) enters the DNA sequence. F B. One adenosine is removed from the DNA sequence. S C. A base sequence of TGA in DNA changes to TAA.
134
a DNA fragment from one organism is combined with DNA in another restriction enzymes are used to cleave a gene from a foreign DNA and open DNA plasmids in Eschericia coli DNA fragments are mixed with the plasmids in E. coli and the ends are joined by ligase the new gene in the altered DNA produces protein
recombinant DNA
135
restriction enzymes cut a DNA sample into smaller fragments (RFLPs) the fragments are sorted by size a radioactive isotope that adheres to certain base sequences in the fragments produces a pattern on X-ray film, which is the “fingerprint” the “fingerprint” is unique to each individual DNA
DNA fingerprinting
136
produces multiple copies of a DNA in a short time separates the sample DNA strands by heating mixes the separated strands with enzymes and nucleotides to form complementary strands is repeated many times to produce a large sample of the DNA
polymerase chain reaction (PCR)
137
are small particles of DNA or RNA that require a host cell to replicate cause a viral infection when the DNA or RNA enters a host cell are synthesized in the host cell from the viral RNA produced by viral DNA
Viruses
138
a retrovirus, which contains viral RNA but no viral DNA, enters a cell the viral RNA uses reverse transcriptase to produce a viral DNA strand the viral DNA strand forms a complementary DNA strand the new DNA uses the nucleotides and enzymes in the host cell to synthesize new virus particles
Reverse transcription
139
is a retrovirus that infects T4 lymphocyte cells decreases the T4 level, making the immune system unable to destroy harmful organisms is associated with an increased chance of developing pneumonia and skin cancer associated with AIDS
HIV-1 virus
140
Match the following: 1) virus 2) retrovirus 3) protease inhibitor 4) reverse transcription A. a virus containing RNA B. small particles requiring host cells to replicate C. a substance that prevents the synthesis of viral proteins D. using viral RNA to synthesize viral DNA
Match the following: 1) virus 2) retrovirus 3) protease inhibitor 4) reverse transcription 2 A. a virus containing RNA 1 B. small particles requiring host cells to replicate 3 C. a substance that prevents the synthesis of viral proteins 4 D. using viral RNA to synthesize viral DNA