Question 1

The figure below shows the structure of an ATP molecule.

Which part of the ATP molecule is shown within the dashed rectangle?

  A  

adenine

  B  

adenosine

  C  

ribose

  D  

deoxyribose

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Question 2

Which statement describes the semi-conservative replication of DNA?

  A  

parental DNA is broken down into nucleotides and reassembled with new nucleotides

  B  

parental DNA is split into triplets and new triplets are added

  C  

parental DNA is split into two strands, each of which is replicated

  D  

parental DNA remains intact and a new daughter DNA copy is built from new nucleotides

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Question 3

A length of double-stranded DNA contains 120 nucleotides and codes for polypeptide X.

What is the maximum length of polypeptide X?

  A  

20 amino acids

  B  

40 amino acids

  C  

60 amino acids

  D  

120 amino acids

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Question 4

During semi-conservative replication of DNA in eukaryotic cells, the following processes occur:

1 - free nucleotides are hydrogen bonded to those on the exposed strand

2 - hydrogen bonds are broken between the complementary base pairs

3 - the cell receives the signal to begin to divide

4 - covalent bonds form between adjacent nucleotides on the same strand

5 - the DNA double helix is unwound

Which shows the correct order of some of the processes?

  A  

3 → 1 → 2 → 4

  B  

3 → 2 → 4 → 5

  C  

5 → 2 → 1 → 4

  D  

5 → 2 → 3 → 1

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Question 5

Which statements about complementary base pairing are correct?

1 - cytosine forms two hydrogen bonds with guanine

2 - purines and pyrimidines are different sizes

3 - adenine forms the same number of hydrogen bonds with thymine and uracil

4 - the base pairs are of equal length

  A  

1, 2, and 3 only

  B  

1, 2, and 4 only

  C  

1, 3, and 4 only

  D  

2, 3, and 4 only

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Question 6

What would be the result of analysing part of a DNA molecule?

  A  

hexose sugars and phosphates in equal proportion, and an equal number of cytosine and guanine bases

  B  

nucleotides and phosphates in equal proportion, and an equal number of adenine and cytosine bases

  C  

pentose sugars and phosphates in equal proportion, and an equal number of adenine and thymine bases

  D  

twice as many phosphates as pentose sugars, and an equal number of adenine and guanine bases

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Question 7

During the semi-conservative replication of DNA, which of these enzymes is required to break hydrogen bonds between the nitrogen-containing bases?

  A  

DNA polymerase


  B  

DNA primase


  C  

DNA ligase

  D  

DNA helicase

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Question 8

The diagram below shows the structure of a nucleotide. A bond is labelled X.

Which statement(s) is/are correct?

1 - X is a phosphodiester bond

2 - the sugar is deoxyribose

3 - the base is a purine

  A  

1, 2, and 3 are correct

  B  

only 1 and 2 are correct

  C  

only 2 and 3 are correct

  D  

only 1 is correct

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Question 9

Which statement describes the function of DNA polymerase?

  A  

break the hydrogen bonds between complementary bases


  B  

make phosphodiester bonds between adjacent nucleotides

  C  

make phosphodiester bonds between polynucleotides

  D  

make the hydrogen bonds between complementary bases

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Question 10

DNA carries the genetic code, which is non-overlapping and degenerate.

Which option contains the correct definitions for non-overlapping and degenerate code?

  A  

each nucleotide is only part of one triplet of bases and the molecule breaks down easily


  B  

the genes follow straight after each other and the molecule breaks down easily

  C  

each nucleotide is only part of one triplet of bases and more than one triplet codes for a specific amino acid

  D  

the genes follow straight after each other and more than one triplet codes for a specific amino acid

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Question 11

The following statements are about the structure of DNA:

1 - purine bases pair with pyrimidine bases

2 - phosphodiester bonds link adjacent nucleotides

3 - there are always equal amounts of adenine and guanine

Which statement(s) is/are true?

  A  

1, 2, and 3

  B  

only 1 and 2

  C  

only 2 and 3

  D  

only 1 

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Question 12

How many hydrogen bonds are holding the two strands of this section of a DNA molecule together?

  A  

16

  B  

32 

  C  

38 

  D  

48

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Question 13

Which statement about nitrogenous bases is correct?

  A  

adenine is a pyrimidine with a double ring structure


  B  

cytosine is a purine with a double ring structure

  C  

guanine is a purine with a single ring structure

  D  

uracil is a pyrimidine with a single ring structure

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Question 14

A double stranded DNA molecule was analysed and 29% of its nucleotide bases were found to be adenine.

What percentage of its nucleotide bases will be cytosine?

  A  

21% 

  B  

29%

  C  

42%

  D  

58%

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