Cell Membrane, Diffusion, Osmosis, Active Transport

Question 1

Thin, flexible barrier

Answer 1

Cell Membrane

Question 2

What is the function of the cell membrane?

Answer 2

Regulates what enters and leaves the cell
Provides protection and support

Question 3

What does it mean for the membrane to be selectively permeable?

Answer 3

It decides what can or can’t pass through
Only some things can pass through

Question 4

List the composition of the cell membrane

Answer 4

Double layered sheet (lipid bilayer)
Held together by phosphate
Stabilized by cholesterol

• *Protein** channels (large openings)
• *Carbohydrate** chains for sensors (antennae)

Question 5

Most of the functions of the membrane are carried out by which type of molecule?

Answer 5

Proteins

Question 6

Brownian Motion states that

Answer 6

Particles in a solution are constantly and randomly moving

Question 7

Does any type of diffusion ever take energy?

Answer 7

NO

Question 8

Movement of particles from high concentration to low concentration

Answer 8

Diffusion

Question 9

When particles move through the lipid bilayer without using energy they are doing

Answer 9

Diffusion

Question 10

Dynamic equilibrium is

Answer 10

When the concentration of particles is EQUAL both inside and outside of the cell but the particles continue to move

Question 11

The movement of WATER across the cell membrane from high concentration to low concentration

Answer 11

Osmosis

Question 12

Water will move into the cell in a _____ solution

Answer 12

Hypotonic

(more water outside than inside)

Question 13

When there is less what inside than outside of the cell, the cell is in a ______ solution

Answer 13

Hypotonic

Question 14

A hypertonic solution is one in which _____

Answer 14

There is less water outside the cell than inside the cell

(water moves out)

Question 15

Equal amounts of water both inside and outside

Answer 15

Isotonic solution

Question 16

What will happen if a cell is placed in a VERY hypotonic solution

Answer 16

It will fill up with too much water and burst (lyse)

Question 17

True or False: Facilitated diffusion requires energy.

Answer 17

False

Question 18

Movement of VERY large particles from high concentration to low concentration

Answer 18

Facilitated diffusion

Question 19

How do particles move across the membrane in facilitated diffusion?

Answer 19

Through protein channels in the cell membrane

Question 20

Movement of particles against the concentration gradient (from low concentration to high concentration)

Answer 20

Active Transport

Question 21

How do particles move across the membrane during active transport

Answer 21

Through channel and carrier proteins

Question 22

Active transport that brings substances INTO the cell

Answer 22

Endocytosis

Question 23

Releasing of materials from the cell (cell poop)

Answer 23

Exocytosis

Question 24

Cell “eating”

Answer 24

Phagocytosis

Question 25

Cell “drinking”

Answer 25

Pinocytosis

Question 26

Taking in of substances by forming a vacuole

Answer 26

Endocytosis

Question 27

Active transport that brings in LARGE particles

Answer 27

Phagocytosis

Question 28

Active transport that takes in small particles or fluids

Answer 28

Pinocytosis

Question 29

Transport across the cell membrane that does NOT require energy

Answer 29

Passive transport