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Discover Biology

Anu Singh-Cundy

Chapter 4

Cell Membranes, Transport, and Communication - all with Video Answers

Educators

Chapter Questions

05:35

Problem 1

Which of the following are not part of the plasma membrane?
a. Proteins
b. phospholipids
c. receptors
d. genes

Dr. Anas Syed
Dr. Anas Syed
Numerade Educator
06:05

Problem 2

A direct input of energy is needed for
a. diffusion.
b. active transport.
c. osmosis.
d. passive transport.

Dr. Anas Syed
Dr. Anas Syed
Numerade Educator
04:26

Problem 3

Which of the following can move across a plasma membrane through simple diffusion?
a. oxygen gas $\left(\mathrm{O}_{2}\right)$
b. hydrogen ions $\left(\mathrm{H}^{+}\right)$
c. aspartic acid, a charged amino acid
d. human growth hormone, a hydrophilic protein

Dr. Anas Syed
Dr. Anas Syed
Numerade Educator
05:01

Problem 4

Water would move out of a cell in
a. a hypotonic solution.
b. an isotonic solution.
c. a hypertonic solution.
d. none of the above

Dr. Anas Syed
Dr. Anas Syed
Numerade Educator
09:03

Problem 5

Channel proteins are different from carrier proteins in that they
a. are needed for simple diffusion but not for facilitated diffusion.
b. help in the transmembrane transport of water, but not of ions.
c. cannot transport substances actively.
d. cannot function without the direct input of energy in the form of ATP.

Dr. Anas Syed
Dr. Anas Syed
Numerade Educator
04:58

Problem 6

Which of the following describes movement of material out of a cell?
a. pinocytosis
b. phagocytosis
c. endocytosis
d. exocytosis

Dr. Anas Syed
Dr. Anas Syed
Numerade Educator
06:24

Problem 7

Which of these cellular connections creates a leak-proof sheet of cells, such as is found in the cells lining the urinary bladder?
a. anchoring junction
b. tight junction
c. plasmodesma
d. gap junction

Dr. Anas Syed
Dr. Anas Syed
Numerade Educator
06:06

Problem 8

Animal cells can directly exchange water and other small molecules through
a. gap junctions.
b. microfilaments.
c. anchoring junctions.
d. tight junctions.

Dr. Anas Syed
Dr. Anas Syed
Numerade Educator
03:27

Problem 9

Cell signaling involves
a. receptor proteins.
b. signaling molecules.
c. target cells.
d. all of the above

Dr. Anas Syed
Dr. Anas Syed
Numerade Educator
04:28

Problem 10

A nerve signal (neurotransmitter)
a. must travel through the bloodstream to reach target cells.
b. acts on a target cell that is nearby.
c. must be long-lived.
d. must be hydrophobic in nature.

Dr. Anas Syed
Dr. Anas Syed
Numerade Educator