Chapter 10 Multiple-choice questions

* not completed

. Carbohydrates are polymers of which of the following class of biological molecule?

Amino acids correct incorrect

Lipids correct incorrect

Nucleotides correct incorrect

Sugars correct incorrect

* not completed

. Only one amino acid has two identical groups attached to its central carbon atom. Which of the following amino acids is it?

Alanine correct incorrect

Valine correct incorrect

Glycine correct incorrect

Cysteine correct incorrect

* not completed

. In nature, glucose mostly exists in the cyclic (rather than linear) form. True or false?

True correct incorrect

False correct incorrect

* not completed

. Which of the following terms correctly describes a compound featuring more than one double bond?

Saturated correct incorrect

Polyunsaturated correct incorrect

Monounsaturated correct incorrect

* not completed

. Which one of the following compounds forms the 'backbone' of fats and oils?

Glycerol correct incorrect

Glucose correct incorrect

Palmitic acid correct incorrect

An amino alcohol correct incorrect

* not completed

. Triacylglycerols featuring fatty acids with unsaturated carbon chains are most likely to be solids at room temperature. True or false?

True correct incorrect

False correct incorrect

* not completed

. Which one of the following nucleotide bases is not found in RNA?

Adenine correct incorrect

Thymine correct incorrect

Guanine correct incorrect

Cytosine correct incorrect

* not completed

. The nucleotides in DNA and RNA have three components: a sugar group, a nitrogenous base, and a phosphate group. Adjacent nucleotides in a nucleic acid are joined by a phosphodiester bond. This bond links the phosphate group of one nucleotide to which one of the following components of a neighbouring nucleotide?

Sugar correct incorrect

Base correct incorrect

Phosphate group correct incorrect

* not completed

. Which one of the following amino acids is unlikely to be found in an alpha-helix?

Leucine correct incorrect

Methionine correct incorrect

Glutamine correct incorrect

Proline correct incorrect

* not completed

. Both DNA and RNA can form double helices. True or false?

True correct incorrect

False correct incorrect

* not completed

. Which one of the following statements best explains why the carbohydrates amylose and glycogen have different structures?

They are composed of different sugar monomers correct incorrect

One of them contains subunits that adopt a linear structure; the other contains subunits that adopt a cyclic structure correct incorrect

One is a saturated compound; the other is unsaturated correct incorrect

In each case, the bonds joining the sugar monomers attach to different positions within the monomers correct incorrect

* not completed

. A single polypeptide chain can only exhibit a single type of secondary structure. True or false?

True correct incorrect

False correct incorrect

* not completed

. Which of the following statements about disulfide bonds are true? Select any that apply.

The disulfide bond is an ionic bond. correct incorrect

Disulfide bonds can be intramolecular, but not intermolecular. correct incorrect

Disulfide bonds occur in both polypeptides and nucleic acids. correct incorrect

Disulfide bonds are stronger than hydrogen bonds. correct incorrect

Disulfide bonds confer structural stability upon the molecules in which they form. correct incorrect

* not completed

. Which two of the following amino acid residues favour the occurrence of a β-turn?

Glutamic acid correct incorrect

Serine correct incorrect

Glycine correct incorrect

Tryptophan correct incorrect

Proline correct incorrect

* not completed

. A beta-barrel is an example of what level of structure?

Primary structure correct incorrect

Secondary structure correct incorrect

Super-secondary structure correct incorrect

Tertiary structure correct incorrect

Quaternary structure correct incorrect

* not completed

. Two strands of a β-sheet are joined by a structure that is given which of the following names?

β-bend correct incorrect

β-turn correct incorrect

β-loop correct incorrect

β-hairpin correct incorrect

β-corner correct incorrect

* not completed

. A polypeptide containing disulfide bonds is likely to be rich in which of the following amino acids?

Alanine correct incorrect

Valine correct incorrect

Glycine correct incorrect

Cysteine correct incorrect

Proline correct incorrect