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Biology

Eldra Solomon, Linda Berg, Diana W. Martin

Chapter 5

Biological Membranes - all with Video Answers

Educators

Chapter Questions

00:43

Problem 1

Which of the following statements is not true? Biological membranes (a) are composed partly of amphipathic lipids (b) have hydrophobic and hydrophilic regions (c) are typically in a fluid state (d) are made mainly of lipids and of proteins that lie like thin sheets on the membrane surface (e) function in signal transduction

Hunza Gilgit
Hunza Gilgit
Numerade Educator
00:37

Problem 2

According to the fluid mosaic model, membranes consist of (a) a lipid-protein sandwich (b) mainly phospholipids with scattered nucleic acids (c) a fluid phospholipid bilayer in which proteins are embedded (d) a fluid phospholipid bilayer in which carbohydrates are embedded (e) a protein bilayer that behaves as a liquid crystal

Hunza Gilgit
Hunza Gilgit
Numerade Educator
02:33

Problem 3

Transmembrane proteins (a) are peripheral proteins (b) are receptor proteins (c) extend completely through the membrane (d) extend along the surface of the membrane (e) are secreted from the cell

Mary Richards
Mary Richards
Numerade Educator
00:51

Problem 4

Which of the following is not a function of the plasma membrane? (a) transports materials (b) helps to structurally link cells together (c) manufactures proteins (d) anchors the cell to the extracellular matrix (e) has receptors that relay signals

Hunza Gilgit
Hunza Gilgit
Numerade Educator
00:52

Problem 5

Which of the following processes requires the cell to expend metabolic energy directly (for example, from ATP)? (a) active transport (b) facilitated diffusion (c) all forms of carrier-mediated transport (d) osmosis (e) simple diffusion

Hunza Gilgit
Hunza Gilgit
Numerade Educator
00:49

Problem 6

Which of the following is an example of carrier-mediated transport? (a) simple diffusion (b) facilitated diffusion (c) movement of water through aquaporins (d) osmosis (e) osmosis when a cell is in a hypertonic solution

Hunza Gilgit
Hunza Gilgit
Numerade Educator
00:46

Problem 7

The action of sodium-potassium pumps is an example of (a) carrier-mediated active transport (b) pinocytosis (c) aquaporin transport (d) exocytosis (e) facilitated diffusion

Hunza Gilgit
Hunza Gilgit
Numerade Educator
00:56

Problem 8

The patch clamp technique (a) cannot be applied to plant cells (b) is mainly used to study exocytosis (c) allows researchers to study single ion channels (d) helped researchers understand signal transduction involving G proteins (e) was developed by singer and Nicolson

Hunza Gilgit
Hunza Gilgit
Numerade Educator
01:02

Problem 9

A cell takes in dissolved materials by forming tiny vesicles around fluid droplets trapped by folds of the plasma membrane. This process is (a) carrier-mediated active transport (b) pinocytosis (c) receptormediated endocytosis (d) exocytosis (e) facilitated diffusion

Hunza Gilgit
Hunza Gilgit
Numerade Educator
02:26

Problem 10

When plant cells are in a hypotonic medium, they (a) undergo plasmolysis (b) build up turgor pressure (c) wilt (d) decrease pinocytosis (e) lose water to the environment

KP
Karenza Pearson
Numerade Educator
00:34

Problem 11

After a ligand binds to receptors in coated pit (a) the ligand binds to receptors in coated vesicle (b) a coated vesicle forms by endocytosis (c) a vesicle enters the cytosol by facilitated diffusion (d) lysosomes destroy protein coating of the pit (e) G proteins signal phagocytosis

Hunza Gilgit
Hunza Gilgit
Numerade Educator
00:57

Problem 12

In signal transduction (a) an extracellular signal is converted to an intracellular signal (b) a signal is relayed through a series of molecules in the membrane (c) signal molecules are destroyed before target cells can respond to the signal (d) answers a, b, and $c$ are correct (e) only answers a and b are correct

Hunza Gilgit
Hunza Gilgit
Numerade Educator
00:46

Problem 13

When a ligand binds with a receptor (a) tight junctions develop (b) a third messenger is activated (c) cell signaling is stopped (d) it activates the receptor (e) a G protein is destroyed

Hunza Gilgit
Hunza Gilgit
Numerade Educator
00:31

Problem 14

G proteins (a) relay a message from the activated receptor to an enzyme that activates a second messenger (b) are GTP molecules
(c) stop cell signaling (d) directly activate protein kinases (e) are hormones that function as first messengers

Hunza Gilgit
Hunza Gilgit
Numerade Educator
00:42

Problem 15

Anchoring junctions that hold cells together at one point like a spot weld are (a) tight junctions (b) adhering junctions (c) desmosomes (d) gap junctions (e) plasmodesmata

Hunza Gilgit
Hunza Gilgit
Numerade Educator
01:42

Problem 16

Junctions that permit the transfer of water, ions, and molecules between adjacent plant cells are (a) tight junctions (b) adhering junctions (c) desmosomes (d) gap junctions (e) plasmodesmata

KP
Karenza Pearson
Numerade Educator
00:43

Problem 17

Junctions that help form the blood-brain barrier are (a) tight junctions (b) adhering junctions (c) desmosomes (d) gap junctions (e) plasmodesmata

Hunza Gilgit
Hunza Gilgit
Numerade Educator