Nucleic acids & DNA replication multiple choice questions

Nucleic Acids & DNA Replication

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1 of 13

Which statement describes the semi-conservative replication of DNA?

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2 of 13

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

What is the maximum length of polypeptide X?

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3 of 13

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?

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4 of 13

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

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5 of 13

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

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6 of 13

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

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7 of 13

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

Diagram showing the structure of a nucleotide with a bond 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

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8 of 13

Which statement describes the function of DNA polymerase?

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9 of 13

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

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

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10 of 13

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?

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11 of 13

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

Diagram showing hydrogen bonds holding two strands of a DNA molecule together.

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12 of 13

Which statement about nitrogenous bases is correct?

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13 of 13

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?

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