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ChemTech (Organic Chem) > Polymerization and Biomolecules > Flashcards

Polymerization and Biomolecules Flashcards

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1
Q
  1. Macromolecule described as large molecules built up
    from small repeating units called as which of the
    following?
    a) Biopolymer
    b) Dimers
    c) Monomers
    d) Metamers
A

c) Monomers

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2
Q
  1. Carbohydrates are polyhydroxy compounds of
    _______________
    a) Glucose
    b) Oligosaccharides
    c) Aldehyde and ketone
    d) Glyceraldehyde
A

c) Aldehyde and ketone

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3
Q
  1. There are several levels of protein structure, which is
    the most complex protien?
    a) Primary
    b) Secondary
    c) Tertiary
    d) Quaternary
A

d) Quaternary

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4
Q
  1. Proteins, which are tremendously complex molecules,
    what are their basic units or building blocks?
    a) Carbohydrates
    b) NH2
    c) Polypeptides
    d) Amino acids
A

d) Amino acids

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4
Q
  1. Amylose is soluble in which of the following solvent?
    a) Water
    b) Alcohol
    c) Partially soluble in alcohol
    d) Soluble in acidic solution
A

a) Water

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4
Q
  1. Nucleic acids are chains of 5-carbon sugars linked by
    which type of bonds with an organic base protruding from
    each sugar?
    a) Amino
    b) Phophodiester
    c) Carbonyl
    d) Phosphate
A

b) Phophodiester

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5
Q
  1. Assuming that all of the below given compound had
    the same number of carbon atoms, which of the following
    has the most C-H bonds?
    a) Unsaturated fat
    b) Polysaturated fat
    c) Polysaccharide
    d) Saturated fat
A

d) Saturated fat

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5
Q
  1. What happens when a macromolecule undergoes
    hydrolysis reaction?
    a) protein coils into its secondary structure
    b) the bond between two subunits of a macromolecule is
    broken
    c) a bond is formed between two subunits of a
    macromolecule
    d) water breaks ionic bonds
A

b) the bond between two subunits of a macromolecule is
broken

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5
Q
  1. In the formation of a macromolecule, what type of bond
    would join two amino acid subunits?
    a) Ionic bond
    b) Phosphodiester bond
    c) Hydrogen bond
    d) Peptide bond
A

d) Peptide bond

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5
Q
  1. Animals store glucose in the form of which
    macromolecule?
    a) Amylose
    b) Glycogen
    c) Glycerol
    d) Cellulose
A

b) Glycogen

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5
Q
  1. In the formation of a macromolecule, what type of
    reaction would join two subunits together?
    a) Hydrophobic reaction
    b) Hydrolysis reaction
    c) Dehydration reaction
    d) Denaturation reaction
A

c) Dehydration reaction

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6
Q
  1. In which of the following groups are all polysaccharides?
    a) sucrose, glucose and fructose
    b) maltose, lactose and fructose
    c) glycogen, sucrose and maltose
    d) glycogen, cellulose and starch
A

d) glycogen, cellulose and starch

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7
Q
  1. Which of the following is not a disaccharide?
    a) Sucrose
    b) Maltose
    c) Lactose
    d) Amylose
A

d) Amylose

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8
Q
  1. What are the most diverse macromolecules in the cell?
    a) lipids
    b) mineral salts
    c) proteins
    d) carbohydrates
A

c) proteins

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8
Q
  1. Amino acids and proteins are ionized at typical
    biological pH such that both the amino group and the
    carboxyl group gain hydrogen ions to become -NH3
    + and COOH, respectively.
    a) True
    b) false
A

a) True

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8
Q
  1. Dehydration and hydrolysis reactions involve removing
    or adding which of the following to macromolecule
    subunits?
    a) C and O
    b) OH and H
    c) CH and NH2
    d) COOH and H
A

b) OH and H

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9
Q
  1. What type of macromolecule carries out catalysis in
    biological systems?
    a) proteins called enzymes
    b) carbohydrates called starches
    c) lipids called steroids
    d) nucleic acids called DNA
A

a) proteins called enzymes

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10
Q
  1. Cellulose is the most important constituent of plant cell
    wall. What are its constituents?
    a) branched chain of glucose molecules linked by (3-1, 4
    glycosidic bond in straight chain and a-1, 6 glycosidic bond
    at the site of branching
    b) unbranched chain of glucose molecules linked by (3-1, 4
    glycosidic bond)
    c) branched chain of glucose molecules linked by a-1, 6
    glycosidic bond at the site of branching
    d) unbranched chain of glucose molecules linked by a-1, 4
    glycosidic bond
A

b) unbranched chain of glucose molecules linked by (3-1, 4
glycosidic bond)

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10
Q
  1. Macromolecules like Enzymes, vitamins and hormones
    can be classified into a single category of biological
    chemicals. Why?
    a) all of these help in regulating metabolism
    b) all of these are exclusively synthesized in the body of a
    living organism as at present
    c) all of these are conjugated proteins
    d) all of these enhance oxidative metabolism
A

c) all of these are conjugated proteins

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11
Q
  1. Which of the following is an initiator molecule in the
    free radical polymerisation?
    a) Benzoyl peroxide
    b) Sulphuric acid
    c) Potassium permanganate
    d) Chromium oxide
A

a) Benzoyl peroxide

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11
Q
  1. Lipids are insoluble in water because of which of the
    following reason?
    a) lipid molecules are hydrophilic
    b) lipid molecules are hydrophobic
    c) lipid molecules are neutral
    d) lipid molecules are zwitterions
A

b) lipid molecules are hydrophobic

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12
Q
  1. Why is vinyl polymerization also known as addition
    polymerization?
    a) monomers are unsaturated compounds
    b) it is a chain reaction
    c) most monomers contain (CH2=CH─) group
    d) it proceeds through radical
A

c) most monomers contain (CH2=CH─) group

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13
Q
  1. Which of the following happens in propagation step of
    the free radical polymerisation?
    a) Decomposition of initiator
    b) Renewal of inhibitor
    c) Addition of monomer molecules to the growing chains
    d) Disproportionation
A

b) Renewal of inhibitor

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13
Q
  1. Which of the following happens in initiation step of the
    free radical polymerisation?
    a) Decomposition of initiator
    b) Renewal of inhibitor
    c) Addition of monomer molecules to the growing chains
    d) Disproportionation
A

a) Decomposition of initiator

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14
6. Which of the following reagents may be used to initiate radical polymerization of styrene? a) HCl b) Peroxides c) Hydroxide ion d) BF3
b) Peroxides
14
5. Which of the following happens in termination step of the free radical polymerisation? a) decomposition of initiator b) addition of free radical to monomer c) addition of monomer molecules to the growing chains d) disproportionation
d) disproportionation
15
8. What is the name for polymers with Z groups only on one side of the carbon chain? a) Enatiometric b) Atactic c) Syndiotactic d) Isotactic
d) Isotactic
16
1. Which of the following is true about copolymerisation? a) radical, coordination, anionic, or cationic polymerization, depending on the type of initiation b) addition of monomer to a metal complex, propagation is by successive insertion of monomer at the metal, and termination occurs when the metal complex separates from the polymer c) monomers react by eliminating small molecules like H2O, NH3, CH2O and NaCl in a repetitive manner, Indefinite growth of the polymer occurs at both ends d) a mixture of more than one (or different) monomeric species is allowed to polymerize
d) a mixture of more than one (or different) monomeric species is allowed to polymerize
17
2. Gradient copolymer comers under which of the following copolymer category? a) Linked copolymer b) Branched copolymer c) Terepolymer d) Brush copolymer
a) Linked copolymer
18
4. Which of the following copolymers is the copolymer with A and B units arranged in a repeating sequence? a) Alternating copolymer b) Periodic copolymer c) Statistical copolymer d) Block copolymer
b) Periodic copolymer
18
3. Which of the following copolymers is the copolymer with regular alternating A and B units? a) Alternating copolymer b) Periodic copolymer c) Statistical copolymer d) Block copolymer
a) Alternating copolymer
19
5. Which of the following copolymers is the copolymer with sequence of monomer residues follows a statistical rule? a) Alternating copolymer b) Periodic copolymer c) Statistical copolymer d) Block copolymer
c) Statistical copolymer
19
10. Which of the following is the condition for ideal copolymerization? a) r1r2=1 b) r1r2=0 c) r1=r2 d) r1=1
a) r1r2=1
20
6. Which of the following copolymers is the copolymer which comprises two or more homopolymer subunits linked by covalent bonds? a) Alternating copolymer b) Periodic copolymer c) Statistical copolymer d) Block copolymer
d) Block copolymer
21
7. Which of the following copolymers is the copolymer in which the main chain is formed from one type of monomer A and branches are formed from another monomer B? a) Terepolymer copolymer b) Graft copolymer c) Statistical copolymer d) Star copolymer
b) Graft copolymer
22
8. Which of the following copolymers is the copolymer with several polymer chains connected to a central core? a) Terepolymer copolymer b) Graft copolymer c) Statistical copolymer d) Star copolymer
d) Star copolymer
23
9. Which of the following copolymers is the copolymer consisting of three distinct monomers? a) Terepolymer copolymer b) Graft copolymer c) Statistical copolymer d) Star copolymer
a) Terepolymer copolymer
24
1. Which of the following is true about coordination polymerisation? a) radical, coordination, anionic, or cationic polymerization, depending on the type of initiation b) polymerization that is catalysed by transition metal salts and complexes c) monomers react by eliminating small molecules like H2O, NH3, CH2O and NaCl in a repetitive manner, Indefinite growth of the polymer occurs at both ends d) a mixture of more than one (or different) monomeric species is allowed to polymerize
b) polymerization that is catalysed by transition metal salts and complexes
24
2. Which catalyst is commonly used in coordination chain polymerization? a) nickel b) ziegler- Natta catalyst c) zeolite d) platinum
b) ziegler- Natta catalyst
24
4. Which of the following olefine undergo coordination polymerisation in the presence of Ziegler-Natta catalysts? a) vinyl chloride b) vinyl ethers c) acrylate esters d) ethylene
d) ethylene
24
2. Which of the following is not true about step growth polymerisation? a) Molar mass of backbone chain increases rapidly at early stage and remains approximately the same throughout the polymerization b) Similar steps repeated throughout reaction process c) Initiator are required for the step growth polymerisation d) Rapid loss of monomer early in the reaction
c) Initiator are required for the step growth polymerisation
25
5. Which of the following is true about heterogeneous Ziegler Natta polymerisation? a) This is based on titanium tetrachloride b) This is based on Kaminsky catalyst c) This is based on neodymium-based catalyst d) This is based on titanium tetrachloride organo aluminium co-catalyst
d) This is based on titanium tetrachloride organo aluminium co-catalyst
25
3. Which of the following is true about homogenous Ziegler Natta polymerisation? a) This is based on titanium tetrachloride organoaluminium co-catalyst b) This is based on Kaminsky catalyst c) This is based on neodymium-based catalyst d) This is based on organoaluminium co-catalyst
b) This is based on Kaminsky catalyst
26
7. Which catalyst is used for the coordination polymerisation of polybutadiene? a) titanium tetrachloride organo-aluminium co-catalyst b) kaminsky catalyst c) neodymium-based catalyst d) organo-aluminium co-catalyst
c) neodymium-based catalyst
27
6. Homogenous Ziegler Natta coordination polymerization occurs via which mechanism? a) Cossee–Arlman mechanism b) Mechanism of free-radical polymerization c) Cationic polymerization mechanism d) Anionic polymerization mechanism
a) Cossee–Arlman mechanism
27
8. Titanium tetrachloride organoaluminium co-catalyst is used in which of the following polymerisation? a) Ziegler-Natta polymerization b) Anionic vinyl polymerization c) Free-radical polymerization d) Metathesis polymerization
a) Ziegler-Natta polymerization
28
1. Which of the following is true about Step-growth polymerisation? a) radical, coordination, anionic, or cationic polymerization, depending on the type of initiation b) polymerization that is catalysed by transition metal salts and complexes c) monomers react by eliminating small molecules like H2O, NH3, CH2O and NaCl in a repetitive manner, Indefinite growth of the polymer occurs at both ends d) monomers react to form first dimers, then trimmers, longer oligomers and eventually long chain polymers
d) monomers react to form first dimers, then trimmers, longer oligomers and eventually long chain polymers
28
3. Which of the following is polymer formed by step growth polymerization is not classified under condensation polymerisation? a) Polyester b) Polyurethane c) Polysiloxane d) Polyamide
b) Polyurethane
29
4. Which monomers are required for the formation of Bakelite via a typical step-growth polymerization? a) phenol and formaldehyde b) isocyanate and alcohol c) diamine and formaldehyde d) ester and phenol
a) phenol and formaldehyde
29
5. Formation of polytriazole polymers via step-growth polymerization is produced from which of the following monomers? a) Compound which bears both alkyne and azide functional group b) Compound which bears both alkene and azide functional group c) Compound which bears both alkane and azide functional group d) Compound which bears both vinyl and azide functional group
a) Compound which bears both alkyne and azide functional group
30
7. What is the trend in the molecular weight of step growth polymer at lower conversion and higher conversion respectively? a) Increase then decrease b) Decreases an increases c) Remains same d) Can’t say about molecular weight
b) Decreases an increases
31
6. How does the reaction rate vary with increasing extent of reaction beyond 94% conversion in self catalyzed reaction? a) decreases b) increases c) remains same d) first increases than decreases
a) decreases
32
8. Which of the following is not prepared by Ziegler-Natta coordination polymerisation? a) High density Polyethylene (HDPE) b) Ultrahigh molecular weight Polyethylene (UHMWPE) c) Ethylene-1-alkenebcopolymer (linear low density polyethylene, LLDPE) d) Polyvinyl acetate (PVAc)
d) Polyvinyl acetate (PVAc)
32
1. In double helix of DNA, the two DNA strands show which type of characteristics? a) coiled around a common axis b) coiled around each other c) coiled differently d) coiled over protein sheath
a) coiled around a common axis
33
2. A nucleotide is formed of which of the following units? a) nitrogen base and phosphate b) nitrogen base, sugar and phosphate c) nitrogen base and sugar d) sugar and phosphate
b) nitrogen base, sugar and phosphate
33
3. Which of the following nitrogenous base is not present in RNA? a) adenine b) thymine c) cytosine d) guanine
a) adenine
34
4. To which of the following does thymine form hydrogen bonds in DNA? a) adenine b) thymine c) cytosine d) guanine
a) adenine
35
5. What term is used to describe the process by which DNA is copied to produce two daughter DNA molecules? a) reproduction b) replication c) translation d) transcription
b) replication
35
7. What amino acid is coded by the triplet of bases UAU? a) phenylalanine b) serine c) tyrosine d) cysteine
d) cysteine
36
6. What term is used to describe the process by which a segment of DNA is copied to produce a molecule of messenger RNA? a) reproduction b) replication c) translation d) transcription
d) transcription
36
11. Glycine and proline are the most abundant amino acids in which of the following structure? a) Hemoglobin b) Myoglobin c) Insulin d) Collagen
d) Collagen
37
9. A nucleoside is formed of which of the following units? a) nitrogen base and phosphate b) nitrogen base, sugar and phosphate c) nitrogen base and sugar d) sugar and phosphate
c) nitrogen base and sugar
37
10. DNA is composed of repeating units of a) ribonucleosides b) deoxyribonucleosides c) ribonucleotides d) deoxyribonucleotides
d) deoxyribonucleotides
37
8. To which of the following does guanine form hydrogen bonds in DNA? a) adenine b) thymine c) cytosine d) guanine
c) cytosine
38
14. Which amino acid can form disulphide bonds? a) Proline b) Leucine c) Cysteine d) Valine
c) Cysteine
38
12. Which of the following statements about amino acids is correct? a) Amino acids are uncharged at neutral pH b) Amino acids are classified according to the structures and properties of their side chains c) Amino acids in proteins are mainly in the D configuration d) Twenty four amino acids are commonly used in protein synthesis
b) Amino acids are classified according to the structures and properties of their side chains
39
13. Which of the following amino acids is mostly likely to disrupt an alpha helix? a) Proline b) Leucine c) Glycine d) Valine
a) Proline
40
15. Which of the following amino acid is a limiting amino acid in pulses? a) Leucine b) Lysine c) Methionine d) Glutamine
c) Methionine
41
16. Which of the characteristics below apply to amino acid Glycine? a) Optically inactive b) Hydrophilic, basic and charged c) Hydrophobic d) Hydrophilic, acidic and charged
a) Optically inactive

ChemTech (Organic Chem) (11 decks)

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