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Flashcards in Chapter 5 Deck (19)
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1
Q

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

A

Phospholipids

2
Q

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

A

Electron

3
Q

Identify the four main components of all eukaryotic membranes.

A

Interior protein network

Cell surface markers

Transmembrane proteins

Lipid bilayer

4
Q

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

A

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

5
Q

How does lipid composition affect membrane fluidity?

A

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
Q

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

Cholesterol

Proteins

Saturated fats

Unsaturated fats

Phospholipids

A

Phospholipids

7
Q

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

A

Phosphatidylcholine

Cholesterol

Sphingomyelin

8
Q

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

A

Extracellular matrix

9
Q

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

A

sphingolipids

sterols

10
Q

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.

A

less

more

11
Q

Identify the four main components of all eukaryotic membranes.

A

Cell surface markers

Transmembrane proteins

Interior protein network

Lipid bilayer

12
Q

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

A

domain

13
Q

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 _____.

A

diffusion

14
Q

In an aqueous solution the solvent is ____.

A

water

15
Q

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

A

solute

solvent

16
Q

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

A

higher

17
Q

Which type of transport proteins use energy from ATP indirectly?

A

Coupled transport proteins

18
Q

Which type of transport proteins use energy from ATP directly?

A

Protein Pumps

19
Q

Which type of transport proteins use energy from ATP indirectly?

A

Coupled transport proteins