Genes/DNA Flashcards

(32 cards)

1
Q

Which of the following are components of nucleotides?

(a) deoxyribose
(b) amino acids
(c) phosphate
(d) enzymes (e) nitrogenous bases

A

Deoxyribose and phosphate

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2
Q

Which of the following represent a correct pairing of bases?

(a) adenine with thymine
(b) adenine with guanine
(c) thymine with adenine
(d) guanine with cytosine
(e) thymine with thymine

A

A,C,D

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3
Q

The building blocks of DNA are:

A

Nucleotides

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4
Q

Which of the following are nitrogenous bases?

(a) Valine
(b) Guanine
(c) Thymine
(d) Serine

A

B,C

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5
Q

Replication of DNA occurs

(a) During cell division
(b) before cell division
(c) at any time

A

B

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6
Q

A nucleotide triplet codes for

(a) a protein
(b) an amino acid
(c) an enzyme
(d) an organic base

A

A

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7
Q

The sequence of bases in DNA forms the

A

Genetic code

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8
Q

A group of three bases (_________) controls the production of a particular amino acid in the cytoplasm of the cell

A

A triplet

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9
Q

Such a sequence forms a

A

Gene

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10
Q

There may be a _________ or more bases in one gene

A

Thousands

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11
Q

Cytosine
Adenine
Thymine=

A

Valine

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12
Q

Cytosine
Guanine
Adenine=

A

Alanine

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13
Q

Each triplet codes for a specific _______

A

Amino acid

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14
Q

The sub-units are called

A

Nucleotides

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15
Q

Each nucleotide is made up of

a sugar called

A

Deoxyribose

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16
Q

is a sugar, like glucose, but with only five carbon atoms in its molecule

17
Q

is almost the same but lacks one

oxygen atom

18
Q

Both molecules may be represented by the symbol

19
Q

The most common bases are

A

Adenine

Thymine

Guanine

Cytosine

20
Q

The deoxyribose, phosphate and one of the bases

Combine to form a

21
Q

When does DNA strands unwind and separate

A

Before cell division

22
Q

Each strand makes a new partner by adding the appropriate

23
Q

The result is that there are now ________ DNA molecules in the nucleus

24
Q

Before a cell divides, the DNA strands unwind and separate Each strand makes a new partner by adding the appropriate nucleotides The result is that there are now two double-stranded DNA molecules in the nucleus So that when the cell divides, each nucleus contains identical DNA

This process is called

25
The sequence of bases in DNA forms the
Genetic code
26
CGA=
Alanine
27
CAA=
Valine
28
DNA is a what
Chemical substance
29
DNA controls all the
Chemical changes
30
The kind of cell which is formed, (muscle, blood, nerve etc) is controlled by ____
DNA
31
The kind of organism which is produced (buttercup, | giraffe, herring, human etc) is controlled by ______
DNA
32
is a very large molecule made up of a long chain of sub-units
DNA