Question 1

Which property of carbon most directly enables it to form the backbone of a diverse array of organic molecules?

Accepted Answer

Its ability to form up to four covalent bonds with other atoms

Question 2

Which functional group is most likely to make a molecule polar and increase its solubility in water?

Accepted Answer

Hydroxyl group ($$-OH)$$

Question 3

A dehydration reaction is essential for forming polymers from monomers. What is the main byproduct of this reaction?

Accepted Answer

Water ($$H_2O)$$

Question 4

Which of the following correctly matches a biological macromolecule with its monomer?

Accepted Answer

Nucleic acid — Nucleotide

Question 5

Starch and cellulose are both polymers of glucose. What is the key difference between them?

Accepted Answer

Starch has branched chains, while cellulose has straight chains that form hydrogen bonds.

Question 6

Which type of chemical bond connects amino acids together in the primary structure of a protein?

Accepted Answer

Peptide bond

Question 7

A patient is found to have a genetic mutation that changes the sequence of nucleotides in a gene. What is the most direct consequence of this mutation?

Accepted Answer

The sequence of amino acids in the protein encoded by the gene may change.

Question 8

Which of the following statements about phospholipids is correct?

Accepted Answer

They have both hydrophilic and hydrophobic regions.

Question 9

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

Accepted Answer

Acid group

Question 10

Why is vegetable oil typically liquid at room temperature while butter is solid?

Accepted Answer

Vegetable oil contains more double bonds in its fatty acid chains than butter.

Question 11

Which level of protein structure is directly affected when a protein is denatured by heat?

Accepted Answer

Secondary and tertiary structure

Question 12

Which of the following is a function of proteins in living cells?

Accepted Answer

Catalyzing chemical reactions as enzymes

Question 13

A DNA strand has the sequence $$5'-ATAGCT-3'. $$What is the complementary DNA strand?

Accepted Answer

$$3'-TATCGA-5'$$

Question 14

Which of the following statements is TRUE regarding the four classes of biological macromolecules?

Accepted Answer

Proteins contain nitrogen in their structure.

Question 15

Which of the following molecules is the main structural component of cell membranes?

Accepted Answer

Phospholipids

Question 16

Which process breaks down polymers into monomers by adding water?

Accepted Answer

Hydrolysis

Question 17

Which of the following is a storage polysaccharide found in animal cells?

Accepted Answer

Glycogen

Question 18

Which of the following best explains why proteins can have such a diverse range of functions?

Accepted Answer

Proteins are composed of 20 different amino acids that can be arranged in countless sequences.

Question 19

Which of the following is a correct statement about DNA and RNA?

Accepted Answer

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

Question 20

A scientist changes the sequence of nucleotides in a gene. What is the most likely effect on the organism?

Accepted Answer

The sequence of amino acids in the protein encoded by the gene may change, potentially altering its function.

The Molecules of Cells: Structure and Function of Biological Macromolecules

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