Question 1

Which of the following best explains why water is able to moderate temperature on Earth?

Accepted Answer

Water has a high specific heat, meaning it can absorb or release large amounts of heat with only slight temperature changes.

Question 2

A solution has a pH of 4. Which of the following statements is correct regarding this solution?

Accepted Answer

It has a higher concentration of $$\mathrm{H^+}$$ ions than $$\mathrm{OH^-}$$ ions.

Question 3

Which property of water allows insects to walk on its surface?

Accepted Answer

Surface tension due to cohesion among water molecules

Question 4

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of electron pairs between atoms

Question 5

A molecule of methane ($$\mathrm{CH_4$}) $$has which type of covalent bonds?

Accepted Answer

Four single covalent bonds

Question 6

Which functional group is responsible for the acidic properties of organic molecules such as amino acids?

Accepted Answer

Carboxyl group ($$\mathrm{-COOH})$$

Question 7

Which statement best describes the difference between dehydration and hydrolysis reactions in biological systems?

Accepted Answer

Dehydration reactions join monomers to form polymers by removing water, while hydrolysis breaks polymers into monomers by adding water.

Question 8

Which of the following is NOT a property of carbon that contributes to the molecular diversity of life?

Accepted Answer

Carbon can form ionic bonds with hydrogen.

Question 9

A buffer solution is important in biological systems because it:

Accepted Answer

Maintains a relatively constant pH by accepting or donating $$\mathrm{H^+}$$ ions.

Question 10

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

Accepted Answer

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

Question 11

Which of the following is a correct chemical reaction for cellular respiration?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + 6\mathrm{O_2$} \rightarrow 6\mathrm{CO_2$} + 6\mathrm{H_2O}$$

Question 12

Which of the following statements about macromolecules is correct?

Accepted Answer

Polymers are formed by joining monomers through dehydration reactions.

Question 13

Which of the following best describes the role of functional groups in organic molecules?

Accepted Answer

Functional groups are responsible for the chemical reactivity and properties of organic molecules.

Question 14

Which of the following is a correct statement about hydrogen bonds?

Accepted Answer

Hydrogen bonds form between the partial positive charge of hydrogen and the partial negative charge of another atom.

Question 15

Which of the following molecules is a polymer composed of glucose monomers?

Accepted Answer

Starch

Question 16

Which property of water is most important for the transport of water from roots to leaves in plants?

Accepted Answer

Cohesion and adhesion

Question 17

Which of the following statements about lipids is correct?

Accepted Answer

Lipids are a diverse group of hydrophobic molecules.

Question 18

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

Accepted Answer

Polymers are large molecules made by joining many monomers together.

Question 19

Which of the following is a real-world example of a buffer system in the human body?

Accepted Answer

Carbonic acid-bicarbonate system ($$\mathrm{H_2CO_3}/\mathrm{$$HCO_3$$^-}) in $$blood

The Chemistry of Life: Foundations for General Biology

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