Question 1

Which of the following best explains why carbon is uniquely suited to form the backbone of organic molecules?

Accepted Answer

Carbon can form up to four covalent bonds, allowing for a diversity of stable structures.

Question 2

Which functional group is correctly matched with its chemical formula and a property it imparts to organic molecules?

Accepted Answer

Amino group: $$-\mathrm{NH}_2$$; acts as a base by accepting H$$^+$$

Question 3

Which process is responsible for joining two monosaccharides to form a disaccharide, and what is the role of water in this reaction?

Accepted Answer

Dehydration synthesis; water is produced as a byproduct

Question 4

Which of the following best describes the difference between a saturated and an unsaturated fat?

Accepted Answer

Saturated fats have only single bonds between carbon atoms, making them solid at room temperature; unsaturated fats have one or more double bonds, making them liquid at room temperature.

Question 5

A patient is diagnosed with a genetic disorder that affects the formation of peptide bonds. Which biological macromolecule would be most directly affected?

Accepted Answer

Proteins

Question 6

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

Accepted Answer

Glycogen and starch are both used for energy storage, but cellulose is used for structural support in plants.

Question 7

Which of the following best describes the primary structure of a protein?

Accepted Answer

The linear sequence of amino acids joined by peptide bonds

Question 8

Which of the following is a correct comparison between DNA and RNA nucleotides?

Accepted Answer

DNA nucleotides contain deoxyribose sugar, while RNA nucleotides contain ribose sugar.

Question 9

Which of the following best explains why lipids are hydrophobic?

Accepted Answer

They consist mainly of long hydrocarbon chains, which are nonpolar and do not interact favorably with water.

Question 10

A scientist denatures a protein by heating it to a high temperature. Which level(s) of protein structure are most likely disrupted?

Accepted Answer

Secondary, tertiary, and quaternary structures

Question 11

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

Accepted Answer

Fatty acid

Question 12

Which bond is responsible for holding together the two strands of DNA in the double helix?

Accepted Answer

Hydrogen bonds between complementary nitrogenous bases

Question 13

Which of the following best describes a dehydration synthesis reaction?

Accepted Answer

A reaction in which two monomers are joined together and a molecule of water is released

Question 14

Which of the following is a correct description of the sugar-phosphate backbone of DNA?

Accepted Answer

It consists of alternating deoxyribose sugars and phosphate groups linked by covalent bonds.

Question 15

Which of the following best explains the role of R group chemistry in amino acids?

Accepted Answer

The R group determines the chemical properties and function of each amino acid.

Question 16

Which of the following is an example of a polysaccharide and its biological function?

Accepted Answer

Cellulose; provides structural support in plant cell walls

Question 17

Which of the following statements about hydrolysis is correct?

Accepted Answer

Hydrolysis breaks polymers into monomers by adding a molecule of water.

Question 18

A mutation causes a change in the sequence of amino acids in a protein. Which level of protein structure is directly affected by this mutation?

Accepted Answer

Primary structure

Question 19

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

Accepted Answer

Adenine pairs with thymine, and guanine pairs with cytosine.

Question 20

Which of the following best describes the difference between a monomer and a polymer?

Accepted Answer

A monomer is a single building block, while a polymer is a chain of many monomers linked together.

Module 3 Molecules of Life: Structure and Function of Biological Macromolecules

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