Question 1

Which of the following best explains why lipids are not considered true polymers?

Accepted Answer

Lipids are not made from repeating monomer subunits like carbohydrates, proteins, and nucleic acids.

Question 2

A dehydration reaction is essential in the formation of which of the following biological molecules?

Accepted Answer

A triglyceride from glycerol and fatty acids

Question 3

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

Accepted Answer

Cellulose is composed of $$\beta 1-4 $$glycosidic linkages, making it indigestible to most animals.

Question 4

A patient is diagnosed with a genetic disorder that affects the primary structure of a protein. Which level of protein structure is directly altered by this mutation?

Accepted Answer

Primary structure

Question 5

Which of the following best describes the difference between saturated and unsaturated fatty acids?

Accepted Answer

Saturated fatty acids have no double bonds and are straight, while unsaturated fatty acids have one or more double bonds causing kinks.

Question 6

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

Accepted Answer

Adenine with thymine

Question 7

A scientist is studying a molecule with the formula $$C_6H_{12}O_6$. Which of the following is most likely true about this molecule?

Accepted Answer

It is a monosaccharide, such as glucose or fructose.

Question 8

Which of the following best explains why enzymes are essential for life?

Accepted Answer

They act as biological catalysts, speeding up chemical reactions by lowering activation energy.

Question 9

Which of the following is a function of phospholipids in biological systems?

Accepted Answer

Forming the main structural component of cell membranes

Question 10

A researcher isolates a molecule with a four-ring carbon skeleton. This molecule is most likely:

Accepted Answer

A steroid

Question 11

Which of the following best describes the backbone of a nucleic acid polymer?

Accepted Answer

A repeating pattern of sugar and phosphate groups linked by phosphodiester bonds

Question 12

Which of the following scenarios would most likely result in the denaturation of a protein?

Accepted Answer

A change in pH or a significant increase in temperature

Question 13

Which of the following is a correct statement about the structure of DNA?

Accepted Answer

The two strands are held together by hydrogen bonds between complementary bases.

Question 14

Which of the following best describes the difference between an aldose and a ketose?

Accepted Answer

An aldose has a carbonyl group at the end of the carbon chain, while a ketose has it within the chain.

Question 15

Which of the following is a correct example of a storage polysaccharide and its function?

Accepted Answer

Glycogen; energy storage in animals

Question 16

A mutation causes a change in the R group of an amino acid in a protein. Which level(s) of protein structure could be affected?

Accepted Answer

Tertiary and possibly quaternary structure

Question 17

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

Accepted Answer

Humans lack the enzyme to hydrolyze $$\beta 1-4 $$glycosidic linkages in cellulose.

Question 18

Which of the following is NOT a component of a nucleotide?

Accepted Answer

A fatty acid

Question 19

Which of the following best describes the process of hydrolysis in biological systems?

Accepted Answer

Hydrolysis adds a water molecule, breaking a bond in a polymer.

Question 20

A scientist is comparing the genomes of two species to study evolutionary relationships. Which field of study does this research best represent?

Accepted Answer

Genomics

The Structure and Function of Large Biological Molecules

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