Question 1

Which of the following best describes the difference between polar covalent bonds and weak hydrogen bonds in water?

Accepted Answer

Polar covalent bonds involve the sharing of electrons between hydrogen and oxygen within a water molecule, while weak hydrogen bonds are attractions between the slightly positive hydrogen of one water molecule and the slightly negative oxygen of another.

Question 2

Which functional group is nonpolar and hydrophobic, and what is its chemical formula?

Accepted Answer

Methyl group; $$\mathrm{H{-}C{-}H} or$$ $$\mathrm{CH_3$}$$

Question 3

Which of the following statements about water is TRUE?

Accepted Answer

Water is a polar molecule, allowing it to dissolve many substances with charges.

Question 4

Which of the following is NOT one of the four most common elements found in living things (CHON)?

Accepted Answer

Calcium

Question 5

What is the main function of carbohydrates in living organisms?

Accepted Answer

Providing quick energy

Question 6

Which statement best explains why water has a high surface tension?

Accepted Answer

Cohesion due to hydrogen bonding between water molecules creates surface tension.

Question 7

Which of the following is a universal monomer for nucleic acids?

Accepted Answer

Nucleotide

Question 8

Which property of water allows it to move up the stem of a plant against gravity?

Accepted Answer

Adhesion

Question 9

Which of the following best describes a condensation reaction?

Accepted Answer

A reaction that assembles small molecules into large ones, producing water as a byproduct.

Question 10

Which of the following is a pentose sugar found in nucleic acids?

Accepted Answer

Ribose

Question 11

Which of the following ions is commonly required by living organisms, but is NOT one of the four most common elements (CHON)?

Accepted Answer

$$\mathrm{Na^+}$$

Question 12

Which functional group is both polar and hydrophilic, and is commonly found in amino acids?

Accepted Answer

Amino group

Question 13

Which statement best describes the role of valence electrons in chemical bonding?

Accepted Answer

Valence electrons are the electrons in the outermost energy level that can be shared or transferred to form chemical bonds.

Question 14

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

Accepted Answer

Water's dipole nature allows it to surround and separate ions due to its partial charges.

Question 15

Which of the following is an example of a hexose monosaccharide?

Accepted Answer

Glucose

Question 16

Which of the following statements about hydrolysis is correct?

Accepted Answer

Hydrolysis breaks down macromolecules into monomers by adding water.

Question 17

Which of the following best describes the relationship between universal and species-specific monomers?

Accepted Answer

Universal monomers are interchangeable building blocks for macromolecules in all organisms, while species-specific monomers are unique to certain species.

Question 18

Which of the following best explains the importance of water for efficient metabolism and transport of particles in living organisms?

Accepted Answer

Water's polarity and dipole nature allow it to dissolve and transport substances with charges, supporting metabolism.

Question 19

Which of the following is a property of the phosphate functional group?

Accepted Answer

Polar and hydrophilic

Question 20

Which of the following best describes the role of cohesion in water?

Accepted Answer

Cohesion is the attraction between water molecules due to hydrogen bonding, resulting in surface tension.

Fundamentals of Biochemistry: Atoms, Water, and Macromolecules

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