Question 1

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of electron pairs between atoms.

Question 2

A scientist observes that plants grow faster when exposed to blue light compared to red light. Which step of the scientific method is the scientist performing if they propose that 'blue light increases the rate of photosynthesis'?

Accepted Answer

Formulating a hypothesis

Question 3

Which of the following is the correct order of biological organization from smallest to largest?

Accepted Answer

Molecule, cell, tissue, organ, organism

Question 4

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

Accepted Answer

High specific heat

Question 5

A patient is diagnosed with anemia due to a mutation that changes a single amino acid in hemoglobin. This is an example of how a change in which level of protein structure can affect function?

Accepted Answer

Primary structure

Question 6

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

Accepted Answer

Ice is less dense than liquid water because its molecules are arranged in a lattice that keeps them farther apart.

Question 7

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

Accepted Answer

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

Question 8

A molecule with the formula $$C_{6}H$$_{12}$$O_{6}$ is classified as which of the following?

Accepted Answer

A monosaccharide

Question 9

Which of the following statements about hydrogen bonds is correct?

Accepted Answer

Hydrogen bonds form between the partial positive charge of hydrogen and the partial negative charge of another atom, such as oxygen.

Question 10

Which of the following best describes the difference between a saturated and an unsaturated fat?

Accepted Answer

Saturated fats have no double bonds between carbon atoms, while unsaturated fats have one or more double bonds.

Question 11

A solution is made by dissolving 10 grams of NaCl (molar mass = $$58.44\ \mathrm{g/mol}) in $$enough water to make $$500\ \mathrm{mL} of $$solution. What is the molarity of the solution?

Accepted Answer

$$0.34\ \mathrm{M}$$

Question 12

Which of the following is a correct example of dehydration synthesis?

Accepted Answer

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

Question 13

Which of the following best explains why carbon can form such a diversity of stable compounds?

Accepted Answer

Carbon can form up to four covalent bonds with other atoms.

Question 14

Which of the following is NOT a function of proteins in living organisms?

Accepted Answer

Storing genetic information

Question 15

A scientist is studying a molecule that is hydrophobic. Which of the following is most likely true about this molecule?

Accepted Answer

It contains many nonpolar covalent bonds.

Question 16

Which of the following best describes the role of valence electrons in chemical bonding?

Accepted Answer

Valence electrons are shared or transferred to form chemical bonds.

Question 17

Which of the following is a correct statement about isomers?

Accepted Answer

Isomers have the same molecular formula but different structures.

Question 18

Which of the following best explains why water is an excellent solvent for ionic compounds?

Accepted Answer

Water molecules surround and separate ions due to their polarity.

Question 19

Which of the following statements about DNA and RNA is correct?

Accepted Answer

DNA is usually double-stranded, while RNA is usually single-stranded.

Question 20

A patient is found to have a mutation in the gene encoding an enzyme, resulting in a nonfunctional protein. Which of the following best explains how this mutation could affect the enzyme's function?

Accepted Answer

The mutation changes the enzyme's active site, preventing substrate binding.

General Biology: Foundational Concepts, Chemistry of Life, Water, Carbon, and Biological Molecules

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