IB BIO 2.6

What are the type of reaction and the product(s) shown in this reaction?

A. Reaction: Condensation, Product(s): two nucleotides

B. Reaction: condensation, Product(s): one dinucleotide

C. Reaction: Hydrolysis, Product(s): two nucleotides

D. Reaction: Hydrolysis, Product(s): one dinucleotide

• A.

• B.

• C.

• D.

Which feature is common to both mRNA and DNA?

• A. Covalent bonds between adjacent nucleotides

• B. Hydrogen bonds between guanine and cytosine

• C. Ribose sugar attached to phosphate

• D. Antiparallel arrangement of polynucleotide strands

The hydrolysis of a pure sample of an organic molecule produces a pentose sugar, thymine, guanine and cytosine. What other substances could be expected to be present in the hydrolysed sample?

• A. RNA

• B. Uracil

• C. Phosphate

• D. ATP

For which discovery about DNA do Watson and Crick receive credit?

• A. DNA is the molecule that genes are made of.

• B. The amount of adenine equals the amount of thymine in an organism

• C. Phosphate–pentose bonding along the nucleotide backbone is covalent.

• D. The shape of DNA is a double helix.

What is a similarity between DNA and RNA?

• A. Both are polymers of nucleotides.

• B. Both are composed of antiparallel strands

• C. Both contain adenine, cytosine and thymine.

• D. Both contain ribose sugar

The diagram shows a molecular structure.

Which type of molecule is shown?

• A. Amino acid

• B. Lipid

• C. Carbohydrate

• D. Nucleotide

Which sequence shows increasing relative size?

• A.

• B.

• C.

• D.

The image shows a DNA nucleotide.

Which correctly identifies the parts labelled I and II?

A. Base (I), Phosphate (II)

B. Ribose (I), Uracil (II)

C. Deoxyribose (I), Base (II)

D. Ribose (I), Adenine (II)

• A.

• B.

• C.

• D.

The diagram shows a dinucleotide.

Which type of bond is identified by the arrow?

• A. Phosphate

• B. Hydrogen

• C. Covalent

• D. Peptide

What links the pairs of complementary bases in a DNA double helix?

• A. Covalent bonds

• B. Hydrogen bonds

• C. Ionic bonds

• D. Peptide bonds