Question 1

Which of the following statements best explains why water is an effective solvent for ionic compounds?

Accepted Answer

Water is a polar molecule, allowing it to surround and separate positive and negative ions due to its partial charges.

Question 2

A radioactive isotope of carbon, $$^{14}C$$, is used in medical imaging. Which of the following statements about $$^{14}C is $$correct?

Accepted Answer

$$^{14}C$$ has the same number of protons but more neutrons than $$^{12}C.$$

Question 3

Which functional group is found in both amino acids and is responsible for their basic properties?

Accepted Answer

Amino group ($$-NH_2$)

Question 4

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

Accepted Answer

Polysaccharides

Question 5

Which property of water allows sweating to cool the human body?

Accepted Answer

Evaporative cooling due to high heat of vaporization

Question 6

Which of the following best describes the difference between a covalent bond and an ionic bond?

Accepted Answer

Covalent bonds involve sharing electrons; ionic bonds involve the transfer of electrons.

Question 7

A protein is exposed to high temperatures and loses its three-dimensional structure. This process is called:

Accepted Answer

Denaturation

Question 8

Which of the following best explains why carbon is the backbone of most biological molecules?

Accepted Answer

Carbon can form four covalent bonds, allowing diverse and complex molecules.

Question 9

A triglyceride is formed by joining one glycerol molecule with three fatty acids. What type of reaction is responsible for this process?

Accepted Answer

Dehydration synthesis

Question 10

Which of the following statements about DNA and RNA is correct?

Accepted Answer

DNA is double-stranded with complementary base pairing; RNA is usually single-stranded.

Question 11

Which of the following best describes the role of hydrogen bonds in the properties of water?

Accepted Answer

Hydrogen bonds create cohesion between water molecules, leading to surface tension.

Question 12

A scientist is studying a molecule with the formula $$C_{6}H$$_{12}$$O_{6}$. This molecule is most likely a:

Accepted Answer

Monosaccharide

Question 13

Which of the following is a correct statement about isotopes?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons.

Question 14

Which of the following best explains why phospholipids form bilayers in water?

Accepted Answer

Phospholipids have both hydrophilic heads and hydrophobic tails, causing them to arrange in bilayers.

Question 15

Which of the following best describes the relationship between monomers and polymers?

Accepted Answer

Polymers are chains of monomers joined by covalent bonds.

Question 16

A patient is diagnosed with a genetic disorder caused by a single base change in their DNA. This change most directly affects which level of protein structure?

Accepted Answer

Primary structure

Question 17

Which of the following is a property of water that helps maintain stable temperatures in living organisms?

Accepted Answer

High specific heat

Question 18

Which of the following best explains why nonpolar covalent bonds do not create partial charges in molecules?

Accepted Answer

Electrons are shared equally, so no partial charges develop.

Question 19

Which of the following is a correct example of a dehydration reaction in biological systems?

Accepted Answer

Joining two amino acids to form a peptide bond, releasing water.

Question 20

A molecule contains a long chain of carbon atoms with hydrogen atoms attached and only single bonds. This molecule is best classified as:

Accepted Answer

A saturated fatty acid

Fundamentals of Chemistry in Biology: Atoms, Bonds, Water, and Biological Molecules

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