Question 1

Which of the following best describes why carbon is central to the molecular diversity of life?

Accepted Answer

Carbon can form up to four covalent bonds, allowing for a variety of molecular shapes and sizes.

Question 2

The Miller-Urey experiment simulated early Earth conditions to test the origin of organic molecules. What was the main conclusion of this experiment?

Accepted Answer

Complex organic molecules can be synthesized from simple inorganic molecules under conditions thought to resemble those of early Earth.

Question 3

Which property of carbon most directly explains its ability to form large, complex, and diverse molecules?

Accepted Answer

Its four valence electrons allow it to form four covalent bonds with a variety of atoms.

Question 4

Which of the following is NOT a way that carbon skeletons can vary to create molecular diversity?

Accepted Answer

Type of bonds (ionic vs. covalent)

Question 5

A fat molecule contains three hydrocarbon tails. Which property of hydrocarbons makes them an efficient form of energy storage in living organisms?

Accepted Answer

They have many nonpolar C-H bonds, which store a large amount of energy.

Question 6

Which of the following statements about isomers is correct?

Accepted Answer

Isomers have the same molecular formula but different structures, leading to different properties.

Question 7

Which type of isomerism is most relevant to the effectiveness of pharmaceutical drugs such as ibuprofen and albuterol?

Accepted Answer

Enantiomerism (mirror-image isomers)

Question 8

Which functional group is responsible for making molecules more soluble in water due to its polarity and ability to form hydrogen bonds?

Accepted Answer

Hydroxyl group ($$-OH)$$

Question 9

A molecule with the functional group $$-COOH is $$expected to:

Accepted Answer

Act as an acid and donate protons in solution.

Question 10

Which functional group is most directly involved in the formation of disulfide bridges that stabilize protein structure?

Accepted Answer

Sulfhydryl group ($$-SH)$$

Question 11

Which functional group is commonly found in DNA and can affect gene expression by modifying the molecule?

Accepted Answer

Methyl group ($$-CH_3$)

Question 12

ATP (adenosine triphosphate) is a key molecule in cellular energy transfer. Which functional group in ATP is most directly responsible for its ability to release energy?

Accepted Answer

Phosphate group ($$-$$OPO_3$$^{2-})$$

Question 13

Which of the following best explains why enantiomers of a drug can have different effects in the human body?

Accepted Answer

Their different spatial arrangements interact differently with biological molecules, affecting binding and activity.

Question 14

Which functional group acts as a base and is found in amino acids?

Accepted Answer

Amino group ($$-NH_2$)

Question 15

A molecule contains both a carboxyl group and an amino group. Which type of biological molecule is this most likely to be?

Accepted Answer

An amino acid

Question 16

Which of the following is a real-world example of the importance of functional groups in biology?

Accepted Answer

The difference between estradiol and testosterone is due to different functional groups, leading to different biological effects.

Question 17

Which of the following best describes the process that occurs when ATP reacts with water?

Accepted Answer

A phosphate group is released, forming ADP and releasing energy.

Question 18

Which of the following statements about the Miller-Urey experiment is FALSE?

Accepted Answer

It proved that life originated from non-living matter.

Question 19

Which of the following functional groups is most likely to be found in a molecule that can form hydrogen bonds with water and is highly soluble?

Accepted Answer

Hydroxyl group ($$-OH)$$

Question 20

Which property of the phosphate group makes it essential for the energy-releasing function of ATP?

Accepted Answer

Its negative charge and ability to participate in hydrolysis reactions

Bio 100 Lec Chapter 4 Study Guide

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