Question 1

Which of the following best describes the concept of evolution as introduced in Chapter 1?

Accepted Answer

Evolution is the change in the genetic composition of a population over time, leading to diversity and adaptation.

Question 2

Water is considered a polar molecule. Which property of water is most directly a result of its polarity?

Accepted Answer

Its high surface tension.

Question 3

When you see beads of water on a waxed car hood, which property of water is being demonstrated?

Accepted Answer

Hydrophobic interactions

Question 4

Which of the following best explains why ice floats on water?

Accepted Answer

Hydrogen bonds in ice create a lattice that is less dense than liquid water.

Question 5

Which equation correctly represents the process of hydrolysis?

Accepted Answer

$$\mathrm{Polymer} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{Monomer}_1 + \mathrm{Monomer}_2$$

Question 6

Which of the following is NOT a way carbon skeletons can vary?

Accepted Answer

Ability to form hydrogen bonds

Question 7

A buffer in biological systems is important because it:

Accepted Answer

Maintains a stable pH by absorbing excess H$$^+ or OH$^-$$ ions.

Question 8

Which of the following best describes the difference between an isotope and an isomer?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons; isomers have the same molecular formula but different structures.

Question 9

Which functional group is represented by the formula $$-COOH$$?

Accepted Answer

Carboxyl group

Question 10

Which of the following statements about saturated and unsaturated fatty acids is correct?

Accepted Answer

Unsaturated fatty acids have kinks in their chains due to double bonds, making them liquid at room temperature.

Question 11

Which of the following best explains why starch can be used as an energy source but cellulose cannot be digested by most animals?

Accepted Answer

Starch contains 1-4 glycosidic linkages that can be broken down by enzymes in animals, while cellulose contains 1-4 linkages in a different orientation that most animals cannot digest.

Question 12

Which of the following is a correct structural difference between DNA and RNA?

Accepted Answer

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

Question 13

Which level of protein structure is primarily responsible for the overall 3D shape of a single polypeptide chain?

Accepted Answer

Tertiary structure

Question 14

Which of the following best describes a peptide bond?

Accepted Answer

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

Question 15

Which of the following is a correct example of a monomer and its corresponding macromolecule?

Accepted Answer

Amino acid and protein

Question 16

Which of the following best explains the role of phospholipids in cell membranes?

Accepted Answer

Phospholipids form a bilayer with hydrophilic heads facing outward and hydrophobic tails facing inward.

Question 17

Which of the following is a correct statement about the process of dehydration synthesis?

Accepted Answer

Dehydration synthesis joins monomers to form polymers by removing a molecule of water.

Question 18

Which of the following is a real-world example of the importance of hydrogen bonds in biology?

Accepted Answer

Hydrogen bonds are responsible for the secondary structure of proteins, such as alpha helices and beta sheets.

Question 19

Which of the following best describes the function of enzymes in biological systems?

Accepted Answer

Enzymes act as catalysts to speed up chemical reactions without being consumed.

Foundations of Biology: Evolution, Chemistry of Life, and Biological Macromolecules

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