1st Exam - Unit 1

Question 1

Phospholipids are ______ molecules that have a hydrophobic tail and hydrophilic head.

Answer 1

Amphipathic

Question 2

The majority of the plasma membrane can be described as a bilayer of __________ with associated proteins.

Answer 2

Phospholipids

Question 3

Which proteins do not protrude into the phospholipid layer but adhere to only one face of the membrane?

Answer 3

Peripheral

Question 4

The type of channel that responds to changes in electrical potential across the membrane is called a(n) ________ -gated channel.

Answer 4

Voltage

Question 5

Tissue Fluid is also called ________.

Answer 5

Interstitial fluid

Question 6

Which group of glycoproteins found on the cell’s surface allow the body to recognize the cells as one of its own?

Answer 6

Cell-identity markers

Question 7

Amphipathic phospholipids arrange themselves into a(n) ______ to form the plasma membrane.

Answer 7

Bilayer

Question 8

The plasma membrane is made up of phospholipids and _______.

Answer 8

Protein

Question 9

Most transmembrane proteins are ________.

Answer 9

Glycoproteins

Question 10

What do voltage-gated ion channels open in response to?

Answer 10

A change in membrane potential

Question 11

Microvilli primarily function to ______.

Answer 11

increase a cell’s surface area

Question 12

What are glycoprotein compounds on the cell surface that allow the body to distinguish the body’s cells from foreign cells called?

Answer 12

Cell-identity markers

Question 13

T or F. Nearly every human cell has a single, non-motile primary cilium a few micrometers long.

Answer 13

True

Question 14

Organelles that extend from the cell membrane and propel material such as mucus, egg cells, or cerebrospinal spinal fluid forward are called

Answer 14

Cilia

Question 15

The fluidity of the plasma membrane is primarily provided by the ______.

Answer 15

Phospholipids

Question 16

Which are usually prevented from moving across the selectively permeable membrane of a cell?

Answer 16

Proteins and Phosphates

Question 17

What is a protein that extends through the cell membrane called _____.

Answer 17

Transmembrane?

Question 18

Passive mechanisms of membrane transport ______.

Answer 18

Do not require ATP

Question 19

The process in which a physical pressure forces fluid through a selectively permeable membrane is called _____.

Answer 19

Filtration

Question 20

Found on the surface of epithelial cells within the respiratory tract, uterine tubes, testes, and ventricles of the brain, aid in moving fluids or cells through these structures?

Answer 20

Cilia

Question 21

Which cell extension uses a power stroke followed by a recovery stroke?

Answer 21

Cilia

Question 22

Movement of gas molecules (oxygen and carbon dioxide) between the air in the lungs and the blood or between the blood and the tissues is by which process?

Answer 22

Diffusion

Question 23

Plasma membranes are selectively permeable. What does this mean?

Answer 23

Some compounds can permeate (pass through) the membrane while others cannot.

Question 24

An increase in surface area of a cell Blank______ the diffusion rate.

Answer 24

Increases

Question 25

What are examples of passive transport?

Answer 25

Filtration
Osmosis
Passive diffusion
Facilitated diffusion