$$[H^+] = 1 \times 10$$^{-4}$$ \ \mathrm{M}$$

Question 1

Which of the following best illustrates the concept of 'emergent properties' in biological systems?

Accepted Answer

A functioning heart can pump blood, but individual heart cells cannot.

Question 2

Which of the following is NOT a characteristic that distinguishes living organisms from non-living matter?

Accepted Answer

Ability to undergo radioactive decay

Question 3

A scientist discovers a unicellular organism with no nucleus. According to the domains of life, this organism most likely belongs to which group?

Accepted Answer

Bacteria

Question 4

Which of the following best describes the role of decomposers in an ecosystem?

Accepted Answer

They recycle nutrients by breaking down dead matter.

Question 5

Which property of water allows it to moderate Earth's climate by absorbing and releasing heat with only slight changes in its own temperature?

Accepted Answer

Moderation of temperature

Question 6

A solution has a pH of 4. What is the concentration of hydrogen ions $$[H^+] in $$this solution?

Accepted Answer

$$[H^+] = 1 	imes 10$$^{-4}$$ \ \mathrm{M}$$

Question 7

Which of the following statements about carbon is TRUE and explains its central role in the chemistry of life?

Accepted Answer

Carbon forms four covalent bonds, allowing for complex molecules such as chains, rings, and branches.

Question 8

Which functional group is responsible for the acidic properties of amino acids?

Accepted Answer

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

Question 9

A patient is given a radioactive isotope for medical imaging. Which property of this isotope makes it useful for this purpose?

Accepted Answer

It emits radiation as it decays, which can be detected by imaging equipment.

Question 10

Which of the following best explains why ice floats on water?

Accepted Answer

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

Question 11

Which of the following best describes the difference between ionic and covalent bonds?

Accepted Answer

Ionic bonds involve the transfer of electrons from one atom to another, while covalent bonds involve the sharing of electron pairs.

Question 12

Which of the following is an example of a dehydration synthesis reaction?

Accepted Answer

Joining two monosaccharides to form a disaccharide and releasing a water molecule.

Question 13

A protein's tertiary structure is primarily determined by which of the following?

Accepted Answer

The overall 3D shape formed by interactions among side chains (R groups) of amino acids.

Question 14

Which of the following best describes the role of hydrogen bonds in the properties of water?

Accepted Answer

Hydrogen bonds allow water molecules to stick together, resulting in cohesion and surface tension.

Question 15

Which of the following scenarios best demonstrates the concept of natural selection?

Accepted Answer

A population of bacteria is exposed to an antibiotic, and only those with a resistance gene survive and reproduce.

Question 16

Which of the following statements about macromolecules is correct?

Accepted Answer

Carbohydrates can be monosaccharides, disaccharides, or polysaccharides.

Question 17

Which of the following best explains why the biconcave shape of red blood cells is important?

Accepted Answer

It increases the surface area for gas exchange, enhancing oxygen transport.

Question 18

Which of the following is a correct pairing of a macromolecule class with its function?

Accepted Answer

Lipids: Membrane structure and energy storage

Question 19

Which of the following best describes the difference between structural isomers and enantiomers?

Accepted Answer

Structural isomers differ in covalent arrangement, while enantiomers are mirror images of each other.

Question 20

A molecule with the formula $$C_6H_{12}O_6$ is most likely which type of macromolecule subunit?

Accepted Answer

A monosaccharide

General Biology: Foundations, Chemistry, and Macromolecules Study Guide

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