Question 1

A cell is placed in a solution and swells until it bursts. Which of the following best describes the tonicity of the solution relative to the cell?

Accepted Answer

Hypotonic

Question 2

Which of the following best describes the movement of molecules during passive transport?

Accepted Answer

Molecules move down their concentration gradient without using cellular energy.

Question 3

Which of the following is a direct energy source for active transport across a membrane?

Accepted Answer

A concentration gradient of another molecule

Question 4

The CFTR gene encodes a transmembrane protein involved in which process?

Accepted Answer

Passive transport

Question 5

Which process allows a cell to ingest large particles such as bacteria?

Accepted Answer

Phagocytosis

Question 6

In a phosphorylation cascade, what is being phosphorylated?

Accepted Answer

The receptor

Question 7

Aldosterone is a steroid hormone that can cross the plasma membrane. Based on this, which property does it most likely have?

Accepted Answer

Relatively nonpolar

Question 8

During epinephrine signaling, what does the G-protein coupled receptor activate?

Accepted Answer

An adenylyl cyclase

Question 9

Which of the following is NOT a way that cells can drive endergonic reactions in the forward direction?

Accepted Answer

Decrease the energy of the transition state

Question 10

If $$\Delta G is $$negative for a reaction, what does this indicate about the reaction?

Accepted Answer

The reaction is exergonic and can occur spontaneously.

Question 11

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes decrease the activation energy of a reaction.

Question 12

Which reaction would have the highest rate, assuming all are exergonic?

Accepted Answer

The one with the lowest activation energy

Question 13

After the action of the pyruvate dehydrogenase (PDH) complex, but before the Citric Acid Cycle, where is the bulk of the energy that was once in glucose?

Accepted Answer

2x acetyl CoA

Question 14

Which process produces two ATP during glycolysis?

Accepted Answer

Substrate level phosphorylation

Question 15

What molecule oxidizes NADH in alcohol fermentation?

Accepted Answer

NAD+

Question 16

Of the carbons that were originally from glucose, pyruvate has how many carbons, and acetyl-CoA has how many?

Accepted Answer

3; 2

Question 17

After the citric acid cycle, but before the action of the electron transport chain, where is the bulk of the energy that was once in glucose?

Accepted Answer

NADH and FADH$$_2$$

Question 18

Which of the following best describes the role of ATP in cellular metabolism?

Accepted Answer

ATP couples exergonic and endergonic reactions.

Question 19

Ibuprofen is an example of which of the following?

Accepted Answer

A competitive inhibitor

Question 20

Which of the following is a property of G-protein coupled receptors (GPCRs)?

Accepted Answer

They span the membrane and transmit signals via conformational change.

Exam 2 Study Guide

Guida di studio - Domande di pratica

Study guide - Flashcard