Question 1

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

Accepted Answer

Lipids are not formed by dehydration synthesis of identical or similar monomers.

Question 2

A patient is diagnosed with a genetic disorder that causes a single amino acid substitution in the hemoglobin protein. Which level of protein structure is directly altered by this mutation?

Accepted Answer

Primary structure

Question 3

During the formation of a disaccharide such as sucrose, which type of reaction occurs and what is the byproduct?

Accepted Answer

Dehydration synthesis; water is released

Question 4

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 phosphate head, forming bilayers in membranes.

Question 5

Which of the following equations correctly represents the molecular formula of glucose, the most common monosaccharide?

Accepted Answer

$\mathrm{C_6H_{12}O_6}$

Question 6

A researcher is studying the breakdown of glycogen in muscle cells during exercise. Which process is responsible for this breakdown, and what molecule is required?

Accepted Answer

Hydrolysis; water

Question 7

Which of the following best explains why cellulose can provide structural support in plant cell walls, but starch cannot?

Accepted Answer

Cellulose has a linear, unbranched structure with hydrogen bonds between chains, making it rigid.

Question 8

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

Accepted Answer

Guanine (G) pairs with Cytosine (C)

Question 9

A protein is exposed to high heat, causing it to lose its three-dimensional structure and function. What is this process called?

Accepted Answer

Denaturation

Question 10

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

Accepted Answer

Unsaturated fatty acids have one or more double bonds, causing kinks and making them liquid at room temperature.

Question 11

Which of the following best explains why a huge variety of polymers can be built from a small set of monomers?

Accepted Answer

Different sequences and combinations of monomers create diverse polymers.

Question 12

Which of the following is a function of nucleic acids in living organisms?

Accepted Answer

Storing and transmitting hereditary information

Question 13

A scientist is comparing the genomes of two different species to determine their evolutionary relationship. Which field of study is she using?

Accepted Answer

Genomics

Question 14

Which of the following best describes the backbone of a polynucleotide strand?

Accepted Answer

A sugar-phosphate chain linked by phosphodiester bonds

Question 15

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

Accepted Answer

DNA $\rightarrow$ RNA $\rightarrow$ Protein

Question 16

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

Accepted Answer

Increased risk of cardiovascular disease

Question 17

Which of the following best explains why proteins can perform such a wide variety of functions in cells?

Accepted Answer

Proteins have diverse three-dimensional structures determined by their amino acid sequences.

Question 18

A mutation causes a protein to misfold, leading to a neurodegenerative disease. Which of the following best explains the molecular basis of this disease?

Accepted Answer

The protein's primary structure is unchanged, but its tertiary structure is altered, affecting function.

Question 19

Which of the following best describes the difference between DNA and RNA?

Accepted Answer

DNA is usually double-stranded and contains deoxyribose; RNA is usually single-stranded and contains ribose.

Question 20

Which of the following best explains the role of enzymes in the synthesis and breakdown of polymers?

Accepted Answer

Enzymes catalyze dehydration reactions to build polymers and hydrolysis reactions to break them down.

Macromolecules: Structure, Function, and Diversity in General Biology

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