Structure of nucleotide, DNA and RNA

Which base pair has a mistake?

• A

• B

• C

• D

Which row correctly identifies the features of DNA and RNA molecules?

• A

• B

• C

• D

DNA was extracted from the pancreas of a walrus and a human liver cell. In which way did the DNA molecules differ?

• the ratio of guanine to cytosine

• the type of pentose sugar

• the types of nucleotides

• the sequence of the nucleotides

Which row correctly describes guanine?

• A

• B

• C

• D

What is the minimum number of hydrogen bonds in a length of DNA containing 900 base pairs?

• 450

• 900

• 1800

• 2700

The diagram shows part of a DNA molecule.

Which part is a nucleotide

• A

• B

• C

• D

This diagram shows a section of a DNA molecule.

What is part X on the diagram?

• Cytosine

• Uracil

• Thymine

• Guanine

This diagram shows a section of DNA

How many hydrogen bonds would be involved in holding these two strands together?

• 10

• 11

• 12

• 14

Which row correctly describes adenine on a strand of DNA?

• A

• B

• C

• D

A piece of DNA 153 base pairs long was analysed to find the number of nucleotide bases in each of the polynucleotide strands. Some of the results are shown below. How many nucleotides containing Thymine (T) were present in strand 2?

• 22

• 29

• 34

• 48