Question 1

Which of the following best describes the primary structure of a protein?

Accepted Answer

The sequence of amino acids in a polypeptide chain.

Question 2

During translation, which molecule brings amino acids to the ribosome?

Accepted Answer

tRNA

Question 3

Which of the following is a function of the ribosome during protein synthesis?

Accepted Answer

Catalyzing the formation of peptide bonds between amino acids.

Question 4

A mutation changes a codon from UAU to UAA. What is the likely result?

Accepted Answer

Translation will terminate prematurely due to a stop codon.

Question 5

Which equation correctly represents the dehydration synthesis of two amino acids?

Accepted Answer

$$\mathrm{Amino\ acid}_1 + \mathrm{Amino\ acid}_2 \rightarrow \mathrm{Dipeptide} + \mathrm{H}_2\mathrm{O}$$

Question 6

Which of the following best explains why sickle cell anemia is caused by a single amino acid substitution?

Accepted Answer

A change in the primary structure alters the protein's folding and function.

Question 7

Which of the following is NOT a component of the translation process?

Accepted Answer

DNA polymerase

Question 8

If a protein is exposed to high heat, which level(s) of structure are most likely to be disrupted?

Accepted Answer

Secondary, tertiary, and quaternary structures

Question 9

Which of the following best describes the role of the central dogma in molecular biology?

Accepted Answer

It explains the flow of genetic information from DNA to RNA to protein.

Question 10

A scientist isolates a molecule with the following sequence: AUG-GGC-UAA. What is this molecule most likely to be?

Accepted Answer

A segment of mRNA

Question 11

Which of the following statements about peptide bonds is correct?

Accepted Answer

Peptide bonds form between the carboxyl group of one amino acid and the amino group of another.

Question 12

Which process is responsible for the synthesis of mRNA from a DNA template?

Accepted Answer

Transcription

Question 13

Which of the following best describes the quaternary structure of a protein?

Accepted Answer

The association of multiple polypeptide subunits.

Question 14

Which of the following is a real-life example of a protein losing its function due to denaturation?

Accepted Answer

Egg whites turning solid when cooked

Question 15

Which of the following equations represents the hydrolysis of a dipeptide?

Accepted Answer

$$\mathrm{Dipeptide} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{Amino\ acid}_1 + \mathrm{Amino\ acid}_2$$

Question 16

Which of the following is true about the genetic code?

Accepted Answer

It is nearly universal among all living organisms.

Question 17

Which of the following best explains why enzymes are specific to their substrates?

Accepted Answer

The active site of an enzyme has a unique shape that fits only specific substrates.

Question 18

A patient is diagnosed with a genetic disorder caused by a frameshift mutation. Which of the following best describes the effect of this mutation?

Accepted Answer

It alters the reading frame, changing every amino acid after the mutation.

Question 19

Which of the following is a function of chaperone proteins in the cell?

Accepted Answer

Assisting in the proper folding of other proteins.

Protein Structure and Function: Study Notes

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