Question 1

Which of the following best describes the process by which a peptide bond is formed between two amino acids?

Accepted Answer

Dehydration synthesis, which removes a water molecule to join the amino acids.

Question 2

What is the correct chemical formula for the general structure of an amino acid?

Accepted Answer

$$NH_2CHRCOOH$$

Question 3

Which component of an amino acid determines its unique identity?

Accepted Answer

The R group (side chain)

Question 4

During digestion, how are peptide bonds in proteins broken down into individual amino acids?

Accepted Answer

By hydrolysis, adding water molecules.

Question 5

Which level of protein structure is primarily determined by the sequence of amino acids?

Accepted Answer

Primary structure

Question 6

Hemoglobin is an example of a protein with which level of structure?

Accepted Answer

Quaternary structure

Question 7

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

Accepted Answer

Storing genetic information

Question 8

Which statement correctly compares DNA and RNA?

Accepted Answer

DNA is usually double-stranded, while RNA is usually single-stranded.

Question 9

What is the complementary DNA strand for the sequence ATGCT?

Accepted Answer

TACGA

Question 10

Which of the following best describes the structure of a nucleotide?

Accepted Answer

A phosphate group, a five-carbon sugar, and a nitrogenous base

Question 11

Which base pairing occurs in DNA?

Accepted Answer

Adenine pairs with thymine

Question 12

Which of the following is a correct function of ATP in human cells?

Accepted Answer

Supplies energy for cellular processes

Question 13

What happens when the terminal phosphate bond in ATP is broken?

Accepted Answer

Energy is released for cellular work

Question 14

Which of the following is true about enzyme function?

Accepted Answer

Enzymes decrease the activation energy required for a reaction.

Question 15

A mutation changes the sequence of amino acids in a protein. Which level of protein structure is directly affected first?

Accepted Answer

Primary structure

Question 16

Which of the following is a correct sequence for the flow of genetic information in protein synthesis?

Accepted Answer

DNA → RNA → Protein

Question 17

Which type of RNA carries amino acids to the ribosome during translation?

Accepted Answer

tRNA

Question 18

If a protein loses its 3D shape due to high temperature, what process has occurred?

Accepted Answer

Denaturation

Question 19

Which of the following is an essential amino acid for humans?

Accepted Answer

Leucine

Question 20

A patient is unable to synthesize collagen due to a genetic mutation. Which protein function is most directly affected?

Accepted Answer

Structural support

Macromolecules in Human Physiology: Proteins and Nucleic Acids

Study Guide - Practice Questions