Question 1

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

Accepted Answer

Water's cohesive behavior due to hydrogen bonding

Question 2

Why does ice float on water, as illustrated by the polar bear on ice in the second image?

Accepted Answer

Ice is less dense than liquid water because hydrogen bonds keep water molecules further apart in solid form

Question 3

Which type of bond is responsible for the attraction between water molecules, as shown in the third image?

Accepted Answer

Hydrogen bond

Question 4

Water is described as a 'universal solvent.' Which property of water allows 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 is most directly responsible for the regulation of body temperature in humans?

Accepted Answer

Ability to moderate temperature due to high specific heat

Question 6

What is the chemical basis for water's polarity?

Accepted Answer

Oxygen is more electronegative than hydrogen, resulting in unequal sharing of electrons

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. Which of the following statements is true?

Accepted Answer

The solution is acidic and has a higher concentration of $$H^+$$ ions than $$OH^-$$ ions

Question 9

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

Accepted Answer

A substance that minimizes changes in $$H^+$$ and $$OH^-$$ concentrations in a solution

Question 10

Which experiment demonstrated that organic compounds could be synthesized from inorganic molecules, challenging vitalism?

Accepted Answer

Stanley Miller's 1953 experiment simulating early Earth conditions

Question 11

Carbon atoms can form diverse organic molecules because they:

Accepted Answer

Have a valence of four, allowing them to form four covalent bonds

Question 12

Which type of isomerism is illustrated when two molecules have the same molecular formula but differ in the spatial arrangement around a double bond?

Accepted Answer

Cis-trans isomerism

Question 13

Ibuprofen exists as two enantiomers, but only one is effective in reducing inflammation. What does this illustrate about biological molecules?

Accepted Answer

The shape and orientation of molecules can affect their biological function

Question 14

Which functional group is present in all amino acids and is responsible for their acidic properties?

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 15

Which functional group is characteristic of alcohols?

Accepted Answer

Hydroxyl group ($$-OH)$$

Question 16

Which of the following molecules contains a ketone functional group?

Accepted Answer

Acetone ($$CH_3COCH_3)$$

Question 17

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

Accepted Answer

Cohesion and adhesion due to hydrogen bonding

Question 18

A buffer solution is prepared by mixing acetic acid ($$CH_3COOH) $$and its conjugate base ($$CH_3COO^-). $$What will happen if a small amount of $$HCl is $$added to this solution?

Accepted Answer

The buffer will neutralize the added $$H^+$$ ions, minimizing the change in pH

Question 19

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

Accepted Answer

Hydrogen bonds between water molecules require significant energy to break

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

스터디 가이드 - 연습 문제

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