Question 1

Which property of water allows a spider to walk on its surface, as shown in the image?

Accepted Answer

Cohesive behavior due to hydrogen bonding

Question 2

Why does ice float on liquid water, as illustrated by the polar bear on ice?

Accepted Answer

Ice is less dense than liquid water because hydrogen bonds keep water molecules farther apart in the solid state

Question 3

Which type of bond is responsible for water's high surface tension?

Accepted Answer

Hydrogen bonds between water molecules

Question 4

Water is described as a 'universal solvent.' Which property of water enables it to dissolve many substances?

Accepted Answer

Its ability to form hydrogen bonds with polar and ionic compounds

Question 5

Which emergent property of water helps regulate Earth's climate by absorbing and releasing heat?

Accepted Answer

Ability to moderate temperature due to high specific heat

Question 6

What type of covalent bond is found within a water molecule?

Accepted Answer

Polar covalent bond

Question 7

Which equation correctly represents the dissociation of water molecules?

Accepted Answer

$$2H_2O \rightarrow H_3O^+ + OH^-$$

Question 8

A solution has a pH of 4. How does its hydrogen ion concentration compare to pure water?

Accepted Answer

It is 1,000 times higher than a solution with pH 7

Question 9

Which of the following best describes a buffer in biological systems?

Accepted Answer

A substance that minimizes changes in the concentrations of $$H^+$$ and $$OH^-$$ ions

Question 10

Which functional group is present in both estradiol and testosterone and is important for their chemical reactivity?

Accepted Answer

Hydroxyl group ($$-OH)$$

Question 11

Which type of isomerism is illustrated by the difference between cis- and trans- forms of a molecule?

Accepted Answer

Cis-trans (geometric) isomerism

Question 12

Stanley Miller's experiment demonstrated that organic molecules could be synthesized from inorganic precursors. Which hypothesis did this experiment support?

Accepted Answer

Mechanism

Question 13

Which functional group is responsible for the acidic properties of acetic acid?

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 14

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

Accepted Answer

Cohesion and adhesion

Question 15

Which of the following molecules is an example of a structural isomer?

Accepted Answer

Butane and Isobutane

Question 16

Which functional group is found in cysteine and is important for protein structure due to its ability to form disulfide bonds?

Accepted Answer

Sulfhydryl group ($$-SH)$$

Question 17

Which property of water explains why coastal regions tend to have milder climates than inland regions?

Accepted Answer

Water's high specific heat capacity

Question 18

Which of the following best explains why carbon can form such a diversity of organic molecules?

Accepted Answer

Carbon has a valence of 4, allowing it to form up to four covalent bonds with other atoms

Question 19

Which of the following is a correct statement about enantiomers?

Accepted Answer

They are mirror images of each other and can have different biological activities

Question 20

If the concentration of $$OH^- in a $$solution is $$1 	imes 10$$^{-6}$$ M, what is the pH of the solution?

Accepted Answer

$$pH = 8$$

Water, Carbon, and the Molecules of Life: Study Notes for General Biology

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