Question 1

Which of the following amino acids is classified as nonessential?

Accepted Answer

Alanine

Question 2

What is the correct three-letter abbreviation for the amino acid tryptophan?

Accepted Answer

Trp

Question 3

Which level of protein structure is primarily stabilized by hydrogen bonds between backbone atoms?

Accepted Answer

Secondary structure

Question 4

A mutation causes a change in the amino acid sequence of a protein. Which level of protein structure is directly affected?

Accepted Answer

Primary structure

Question 5

Which of the following is NOT a function of proteins in the human body?

Accepted Answer

Storing genetic information

Question 6

Which statement best describes the role of enzymes in biochemical reactions?

Accepted Answer

Enzymes lower the activation energy, speeding up reactions.

Question 7

Which of the following is an irreversible enzyme inhibitor?

Accepted Answer

Covalent inhibitor

Question 8

Which of the following best describes the function of antibodies?

Accepted Answer

They recognize and bind to foreign molecules.

Question 9

Which of the following is true about the Central Dogma of molecular biology?

Accepted Answer

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

Question 10

Which base pairs with cytosine in DNA?

Accepted Answer

Guanine

Question 11

Which scientist is credited with discovering the double helix structure of DNA?

Accepted Answer

James Watson and Francis Crick

Question 12

What is the main difference between DNA and RNA nucleotides?

Accepted Answer

DNA contains deoxyribose, RNA contains ribose.

Question 13

Which process involves the synthesis of RNA from a DNA template?

Accepted Answer

Transcription

Question 14

During translation, what is the role of tRNA?

Accepted Answer

It carries amino acids to the ribosome.

Question 15

Which of the following equations correctly represents the formation of a peptide bond between two amino acids?

Accepted Answer

$$\mathrm{Amino\ acid}_1 + \mathrm{Amino\ acid}_2 \rightarrow \mathrm{Dipeptide} + H_2O$$

Question 16

A patient is exposed to cyanide, which inhibits cytochrome c oxidase, an enzyme in the electron transport chain. What type of inhibition is this?

Accepted Answer

Irreversible inhibition

Question 17

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

Accepted Answer

The arrangement of multiple polypeptide chains into a functional protein.

Question 18

Which of the following is a correct complementary base pairing in DNA?

Accepted Answer

$$A - T$$

Question 19

Which of the following is a function of mRNA in the process of protein synthesis?

Accepted Answer

It carries the genetic code from DNA to the ribosome.

Question 20

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

Accepted Answer

Enzymes have active sites that are complementary in shape to their substrates.

Chapter 10 & 11

Study Guide - Practice Questions