Question 1

Which property of water allows it to dissolve ionic compounds such as NaCl, and what is the molecular basis for this property?

Accepted Answer

Polarity; water molecules surround ions with their partially charged regions

Question 2

A drop of water placed on a waxy leaf beads up rather than spreading out. Which property of water is primarily responsible for this phenomenon?

Accepted Answer

Surface tension

Question 3

Which of the following best explains why water has a high specific heat capacity?

Accepted Answer

Hydrogen bonds between water molecules absorb energy before breaking

Question 4

A scientist adds a hydrophilic substance to water. What will most likely happen?

Accepted Answer

The substance will dissolve easily due to its charge or polarity

Question 5

Which equation correctly represents the dehydration synthesis reaction that forms a dimer from two monomers?

Accepted Answer

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

Question 6

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

Accepted Answer

Amino group ($$-\mathrm{NH}_2)$$

Question 7

Why does water move up narrow tubes in plants, a process known as capillary action?

Accepted Answer

Due to both adhesion to the tube walls and cohesion between water molecules

Question 8

Which of the following best describes a hydrolysis reaction?

Accepted Answer

Breaking a polymer into monomers by adding a water molecule

Question 9

A patient is suffering from dehydration. Which property of water is most relevant to the body's ability to regulate temperature during this condition?

Accepted Answer

Water's high heat of vaporization

Question 10

Which statement best explains why ice floats on liquid water?

Accepted Answer

Hydrogen bonds in ice create an open lattice structure, making it less dense than liquid water

Question 11

Which of the following is a correct description of a solution?

Accepted Answer

A homogeneous mixture of a solute dissolved in a solvent

Question 12

Which property of water is most important for the transport of nutrients and waste in the bloodstream?

Accepted Answer

Solvency

Question 13

Which of the following best describes the molecular structure of water?

Accepted Answer

Bent molecule with a bond angle of approximately $$105^\circ$$

Question 14

Which of the following is NOT a result of hydrogen bonding in water?

Accepted Answer

Low boiling point

Question 15

Which process is responsible for the cooling effect when sweat evaporates from the skin?

Accepted Answer

Evaporative cooling

Question 16

Which of the following is a correct representation of the hydrolysis of a dimer?

Accepted Answer

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

Question 17

Which property of water is most important for its role as a universal solvent in biological systems?

Accepted Answer

Its polarity and ability to form hydrogen bonds

Question 18

Which of the following statements about organic molecules is correct?

Accepted Answer

Carbon atoms can form rings or long chains that serve as the backbone for organic molecules

Question 19

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

Accepted Answer

A monomer is a single subunit; a polymer is a chain of bonded monomers

Question 20

Which functional group is found in all proteins and is essential for peptide bond formation?

Accepted Answer

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

Properties of Water, Hydrocarbons, and Functional Groups: Cell Biology Study Notes

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