Chapter 2 Multiple Choice Questions

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. Which of the following amino acids could form a sidechain hydrogen bond?

Alanine correct incorrect

Phenylalanine correct incorrect

Isoleucine correct incorrect

Serine correct incorrect

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. Which of the following amino acids is hydrophobic?

Glutamic acid correct incorrect

Asparagine correct incorrect

Leucine correct incorrect

Lysine correct incorrect

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. Which amino acid has a sidechain larger than valine but smaller than phenylalanine?

Isoleucine correct incorrect

Alanine correct incorrect

Glycine correct incorrect

Tryptophan correct incorrect

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. What is, approximately, the ratio of the strength of an ordinary covalent chemical bond to the strength of a hydrogen bond?

1.5 correct incorrect

20 correct incorrect

500 correct incorrect

0.01 correct incorrect

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. Raising the temperature from room temperature to 100^o C

will break ordinary covalent bonds but not hydrogen bonds. correct incorrect

will break both hydrogen bonds and covalent bonds. correct incorrect

will break neither hydrogen bonds nor covalent bonds. correct incorrect

will break hydrogen bonds but not covalent bonds. correct incorrect

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. All but one of the following contributes to the stability of the native states of proteins. Which one does not?

Ionic bonds correct incorrect

The hydrophobic effect correct incorrect

Van der Waals forces correct incorrect

Hydrogen bonds correct incorrect

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. Which of the following tripeptides would you expect to be the most water soluble?

Ala-Ala-Met correct incorrect

Phe-Ile-Trp correct incorrect

Lys-Thr-Ser correct incorrect

Leu-Pro-Leu correct incorrect

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. Which of the following is NOT a common supersecondary structure in Proteins?

Disulphide bridge correct incorrect

β-α-β unit correct incorrect

α-helix hairpin correct incorrect

β-hairpin correct incorrect

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. An operon is

a protein that undergoes conformational change. correct incorrect

a protein with a fixed function. correct incorrect

a set of proteins arising from variable splicing of a single region of the genome. correct incorrect

a series of tandem genes in a genome that are coordinately transcribed. correct incorrect

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. All but one of the following diseases is associated with protein aggregation. Which one is not?

Alzheimer's disease correct incorrect

Bovine spongiform encephalopathy ('Mad cow disease') correct incorrect

COVID-19 correct incorrect

Parkinson's disease correct incorrect