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Flashcards in Chapter 5 Deck (19)
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1

Which of the following makes up the bilayer of every cell membrane?

Phospholipids

2

What type of microscope can be used to see the two phospholipid layers in a plasma membrane?

Electron

3

Identify the four main components of all eukaryotic membranes.

Interior protein network

Cell surface markers

Transmembrane proteins

Lipid bilayer

4

When phospholipids are placed in water, they spontaneously form a bilayer with which of the following?

The polar heads on the surface and the nonpolar tails in the interior

5

How does lipid composition affect membrane fluidity?

Sterols, such as cholesterol, can either increase or decrease membrane fluidity depending on temperature.

Saturated fatty acids tend to make the membrane less fluid because they pack together well.

6

Which of the following makes up the bilayer of every cell membrane?

Cholesterol

Proteins

Saturated fats

Unsaturated fats

Phospholipids

Phospholipids

7

Compared to the ER membrane, the plasma membrane contains more of which of the following (choose all that apply)?

Phosphatidylcholine

Cholesterol

Sphingomyelin

8

Which of the following is not one of the four main components of all plasma membranes?

Interior protein network

Transmembrane proteins

Lipid bilayer

Extracellular matrix

Cell surface markers

Extracellular matrix

9

Although a eukaryotic cell membrane can contain many different lipids, they can be classified in three groups: glycerol phospholipids, ____, and ______.

sphingolipids

sterols

10

The lack of double bonds in saturated fats allow them to pack together tightly, and therefore the membrane is ______ fluid. The presence of double bonds in unsaturated fats prevent them from packing together tightly, and therefore the membrane is ______ fluid.

less

more

11

Identify the four main components of all eukaryotic membranes.

Cell surface markers

Transmembrane proteins

Interior protein network

Lipid bilayer

12

Each membrane-spanning region of a transmembrane protein is called a transmembrane _______.

domain

13

Due to the constant random motion of its atoms and molecules, a substance will exhibit net movement from a region where it has a higher concentration to a region where it has a lower concentration. This net movement is called _____.

diffusion

14

In an aqueous solution the solvent is ____.

water

15

When 10 grams of NaCl are dissolved in 1 L of water, NaCl is called the ___ and water is called the _____.

solute

solvent

16

An aqueous solution with a lower concentration of solutes will have a ____ concentration of free water molecules.

higher

17

Which type of transport proteins use energy from ATP indirectly?

Coupled transport proteins

18

Which type of transport proteins use energy from ATP directly?

Protein Pumps

19

Which type of transport proteins use energy from ATP indirectly?

Coupled transport proteins