Question 1

Which of the following statements best describes a covalent bond?

Accepted Answer

Outer shell electrons of two atoms are shared so that both fill their orbitals.

Question 2

Which of the following bonds has the highest bond energy?

Accepted Answer

C≡C

Question 3

An oxygen atom, with 6 electrons in its outer shell, can form a maximum of how many covalent bonds?

Accepted Answer

2

Question 4

Which of the following statements about water is FALSE?

Accepted Answer

It takes very little heat to change the temperature of water.

Question 5

Carbon has a valence of $4$, allowing it to form ____ chemical bonds with other atoms.

Accepted Answer

4

Question 6

Match the functional group to the description: 'can form disulfide bonds.'

Accepted Answer

Sulfhydryl

Question 7

Which of the following forms of energy is least available to accomplish cellular work?

Accepted Answer

Thermal energy

Question 8

The mathematical expression for the change in free energy of a system is: $\Delta G = \Delta H - T \Delta S$. Which of the following is correct?

Accepted Answer

The difference in energy between reactants and products

Question 9

If the standard Gibbs' free energy, $\Delta G^\circ$, for a reaction is positive then:

Accepted Answer

The reactants will be favored

Question 10

Which of the following statements about enzyme kinetics is FALSE?

Accepted Answer

An increase in the substrate concentration at constant enzyme concentration results in a one-to-one increase in the rate of the reaction.

Question 11

Phosphofructokinase 1 is an enzyme in glycolysis that converts fructose 6-phosphate to fructose 1,6-bisphosphate. ADP binds to this enzyme at sites other than the active sites and causes the reaction velocity to increase. All of the following would be true EXCEPT:

Accepted Answer

ADP is a competitive inhibitor.

Question 12

A sick person has a fever which can inhibit the growth of bacteria because:

Accepted Answer

The higher temperature increases the activity of enzymes.

Question 13

Which statement regarding carbohydrates is FALSE?

Accepted Answer

Structural polysaccharides include cellulose and starch while storage polysaccharides include glycogen and peptidoglycan.

Question 14

Which of the following forces mediate secondary structure of proteins? (Select all that apply)

Accepted Answer

Hydrogen bonds

Question 15

Which process involves an increase in entropy of the system?

Accepted Answer

Combustion of paper

Question 16

A cell is placed in a solution and swells until it bursts. What type of solution was the cell placed in?

Accepted Answer

Hypotonic

Question 17

Which of the following statements about membrane transport is correct?

Accepted Answer

Active transport requires a membrane protein and energy input.

Question 18

Which of the following is NOT a method of enzyme regulation?

Accepted Answer

Denaturation by boiling

Question 19

Which statement about the induced fit model of enzyme activity is correct?

Accepted Answer

It involves a conformational change in the shape of the enzyme.

Question 20

An inhibitor is able to bind to an enzyme but not to the enzyme-substrate ES complex when the substrate is bound to the enzyme. This inhibitor is called:

Accepted Answer

Competitive inhibitor

Cell Biology Study Guide: Molecular Structure, Bioenergetics, Enzymes, and Membranes

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