Question 1

Which of the following is NOT a major function of proteins in cells?

Accepted Answer

Storing genetic information

Question 2

Hemoglobin is an example of which type of protein function?

Accepted Answer

Transport

Question 3

Which protein is responsible for storing iron in animal cells?

Accepted Answer

Ferritin

Question 4

Transmembrane proteins are crucial for which cellular process?

Accepted Answer

Transporting molecules across the cell membrane

Question 5

Which of the following best describes the role of enzymes in metabolic pathways?

Accepted Answer

Enzymes lower the activation energy, speeding up reactions

Question 6

A mutation causes a cell to produce defective collagen. Which function is most likely to be impaired?

Accepted Answer

Structural support in connective tissues

Question 7

Which protein type is directly involved in muscle contraction?

Accepted Answer

Actin and myosin

Question 8

Insulin is classified as which type of protein?

Accepted Answer

Hormonal signaling protein

Question 9

Which of the following statements about enzymes is TRUE?

Accepted Answer

Enzymes catalyze reactions by lowering the activation energy $$E_a$$

Question 10

A cell is exposed to a toxin that blocks the function of receptor proteins. Which process would be most directly affected?

Accepted Answer

Response to chemical signals

Question 11

Which protein is most likely to be involved in defending the body against pathogens?

Accepted Answer

Antibody

Question 12

Transcription factors are proteins that interact with nucleic acids to regulate which process?

Accepted Answer

Gene expression

Question 13

Which of the following is an example of a protein providing structural support?

Accepted Answer

Keratin in hair and nails

Question 14

Which equation best represents the effect of an enzyme on the activation energy of a reaction?

Accepted Answer

$$E_{a,enzyme} \u003c E_{a,uncatalyzed}$$

Question 15

Which protein function is most directly involved in the selective acceleration of chemical reactions?

Accepted Answer

Enzymatic proteins

Question 16

A patient is unable to absorb iron efficiently due to a genetic disorder. Which protein is most likely affected?

Accepted Answer

Ferritin

Question 17

Which of the following scenarios best illustrates the function of a signal receptor protein?

Accepted Answer

A nerve cell detects a neurotransmitter released by another cell

Question 18

Which of the following is TRUE about the hydrolysis of a polysaccharide catalyzed by an enzyme?

Accepted Answer

The reaction consumes a molecule of water

Question 19

Which of the following best describes the role of motor proteins in cells?

Accepted Answer

They generate movement by using energy from ATP hydrolysis

Question 20

Which of the following is a correct statement about the diversity of protein functions?

Accepted Answer

Proteins can serve as enzymes, structural components, transporters, and more

Protein Function: The Workhorses of the Cell

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