Question 1

Which of the following best describes the difference between the synthesis and breakdown of polymers in biological systems?

Accepted Answer

Synthesis of polymers occurs by dehydration reactions, while breakdown occurs by hydrolysis.

Question 2

A patient is diagnosed with a genetic disorder that affects the enzyme responsible for breaking down glycogen in muscle cells. Which process is most directly impaired?

Accepted Answer

The hydrolysis of glycogen to release glucose during increased energy demand.

Question 3

Which of the following statements about cellulose and starch is correct?

Accepted Answer

Starch is composed of α-glucose monomers with α-1,4 linkages, while cellulose is composed of β-glucose monomers with β-1,4 linkages.

Question 4

Which of the following best explains why saturated fats are solid at room temperature while unsaturated fats are liquid?

Accepted Answer

Saturated fats have no double bonds, allowing their hydrocarbon chains to pack tightly, while unsaturated fats have cis double bonds that create kinks and prevent tight packing.

Question 5

A researcher is studying a protein that loses its function when exposed to high salt concentrations. What is the most likely explanation for this observation?

Accepted Answer

High salt concentrations cause denaturation by interfering with ionic bonds and other interactions stabilizing the tertiary structure.

Question 6

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

Accepted Answer

$$A$$ pairs with $$T$$ and $$G$$ pairs with $$C$$

Question 7

Which of the following best describes the structure of a phospholipid and its role in biological membranes?

Accepted Answer

A phospholipid has two fatty acid tails and a hydrophilic head, forming a bilayer in water.

Question 8

A single amino acid substitution in the primary structure of hemoglobin leads to sickle-cell disease. Which level(s) of protein structure are affected by this mutation?

Accepted Answer

Primary, secondary, tertiary, and quaternary structures are all affected.

Question 9

Which of the following best explains why humans cannot digest cellulose?

Accepted Answer

Humans lack enzymes that can hydrolyze β-1,4 glycosidic linkages in cellulose.

Question 10

Which of the following is NOT a function of proteins in living organisms?

Accepted Answer

Storing genetic information

Question 11

Which of the following statements about nucleic acids is correct?

Accepted Answer

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

Question 12

A scientist is comparing the genomes of two closely related species. Which field of study is she most likely working in?

Accepted Answer

Genomics

Question 13

Which of the following best describes the role of hydrogen bonds in the secondary structure of proteins?

Accepted Answer

Hydrogen bonds form between the repeating backbone constituents, stabilizing α helices and β sheets.

Question 14

Which of the following is a correct description of a dehydration reaction?

Accepted Answer

A reaction that removes a water molecule to form a new bond between monomers.

Question 15

Which of the following best explains why trans fats are considered unhealthy?

Accepted Answer

Trans fats are unsaturated fats with trans double bonds that may contribute more to cardiovascular disease than saturated fats.

Question 16

Which of the following is a correct formula for a hexose monosaccharide?

Accepted Answer

$$C_6H_{12}O_6$

Question 17

Which of the following best describes the relationship between genes and proteins?

Accepted Answer

Genes consist of DNA, which is transcribed into mRNA and then translated into proteins.

Question 18

Which of the following is a function of chitin in living organisms?

Accepted Answer

Structural support in fungal cell walls and arthropod exoskeletons

Question 19

A mutation causes a protein to misfold, leading to a neurodegenerative disease. Which of the following diseases is most likely associated with this phenomenon?

Accepted Answer

Alzheimer's disease

The Structure and Function of Large Biological Molecules

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