Chapter 3 Online quizzes

The monomeric constituent of a nucleic acid is:

An amino acid.

A nucleotide.

A monosaccharide.

A fatty acid.

Which of the following does not contain phosphate?

A nucleoside

A nucleotide

DNA

RNA

A DNA structure that can be adopted by inverted repeat sequences contained in double-stranded DNA is :

a triplex.

a cruciform.

a quadruplex.

Z-DNA

According to Chargaff's equivalence rules, which of the following statements about bases in DNA is Correct?

All DNA molecules contain the same proportions of A, C, G and T.

Single-stranded DNA molecules contain the same amount of A and T.

In double-stranded DNA, the amount of T equals the amount of C.

In double-stranded DNA, the amount of G equals the amount of C.

Which of the following scientists obtained the X-ray diffraction data that helped determine the structure of DNA?

James Watson

Maurice Wilkins

Francis Crick

Rosalind Franklin

Which of the following nitrogen-containing bases is not usually found in RNA?

Adenine

Thymine

Guanine

Cytosine

Approximately what proportion of the human genome makes up coding DNA sequences?

2%

20%

80%

98%

What type of enzyme is used in recombinant DNA technology to break phosphodiester bonds in each strand of a DNA double helix?

Esterase

Restriction enzyme

Lipase

Ligase

Which scientist was awarded the 1993 Nobel Prize in Chemistry for his development of the Polymerase Chain Reaction?

Craig Venter

Kary Mullis

Frederick Sanger

Linus Pauling

Why are heat stable DNA polymerases an essential component of the polymerase chain reaction?

All components of a PCR reaction must be purified from thermophilic bacteria.

Heat stable DNA polymerases are needed to separate the two DNA strands.

These DNA polymerases are stable at the high temperatures required to separate the two DNA strands.

Heat stable DNA polymerases can be easily synthesised in a laboratory.

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