Question 1

Which of the following statements best explains why carbon is central to the molecular diversity of life?

Accepted Answer

Carbon can form covalent bonds with up to four other atoms, allowing for straight, branched, or ring structures.

Question 2

Which functional group is responsible for the acidic properties of amino acids and fatty acids?

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 3

A dehydration reaction is crucial in the synthesis of biological polymers. What is the net chemical change during this process?

Accepted Answer

A water molecule is removed, forming a new covalent bond between monomers.

Question 4

Which of the following best describes the difference between starch and cellulose?

Accepted Answer

Starch is composed of glucose monomers with $$\alpha$$ glycosidic linkages, while cellulose has glucose monomers with $$\beta$$ glycosidic linkages.

Question 5

Which of the following is NOT a polymer?

Accepted Answer

Lipid

Question 6

A patient is diagnosed with sickle-cell disease. Which level of protein structure is directly affected by the mutation responsible for this disease?

Accepted Answer

Primary structure

Question 7

Which of the following statements about phospholipids is correct?

Accepted Answer

Phospholipids have two fatty acid tails and a hydrophilic head.

Question 8

Which of the following best explains why enzymes are considered biological catalysts?

Accepted Answer

Enzymes speed up chemical reactions without being permanently changed or consumed.

Question 9

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

Accepted Answer

Adenine pairs with thymine, and guanine pairs with cytosine.

Question 10

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

Accepted Answer

A nucleotide consists of a nitrogenous base, a pentose sugar, and one or more phosphate groups.

Question 11

Which process is responsible for breaking down polymers into monomers in the digestive tract?

Accepted Answer

Hydrolysis

Question 12

Which of the following is a real-world consequence of consuming a diet high in saturated fats?

Accepted Answer

Increased risk of cardiovascular disease due to plaque formation in arteries.

Question 13

Which of the following is a correct description of a peptide bond?

Accepted Answer

A peptide bond is a covalent bond formed between the carboxyl group of one amino acid and the amino group of another.

Question 14

Which of the following statements about isomers is correct?

Accepted Answer

Isomers have the same molecular formula but different structural arrangements.

Question 15

A scientist discovers a molecule with a long hydrocarbon chain and a carboxyl group at one end. Which type of biological molecule is this most likely to be?

Accepted Answer

Fatty acid

Question 16

Which of the following is a function of chaperonins in the cell?

Accepted Answer

Chaperonins assist in the proper folding of other proteins.

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 complex.

Question 18

Which of the following is a correct summary of the flow of genetic information in a cell?

Accepted Answer

$$	ext{DNA} ightarrow 	ext{RNA} ightarrow 	ext{Protein}$$

Question 19

Which of the following is a structural polysaccharide found in the exoskeletons of arthropods and the cell walls of fungi?

Accepted Answer

Chitin

Question 20

Which of the following is a correct description of the antiparallel arrangement in DNA?

Accepted Answer

The two strands of DNA run in opposite directions: one 5' to 3', the other 3' to 5'.

The Structure and Function of Large Biological Molecules

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