Human Bio 3 Plasma Membrane

Question 1

The structure of the Plasma Membrane:

Answer 1

Phospholipid Bilayer / 2 layers of phospholipids

Question 2

Each Phosphlipid is made up of:

Answer 2

Phosphate Head( Hydrophillic)
Fatty Acid Tail (Hydrophobic)

Question 3

Function of the Plasma Membrane:

Answer 3

Acts as a protective barrier for cell

Regulates what enters/exits the cell

Question 4

The 2 types of cellular transportation across the Plasma Membrane:

Answer 4

Passive + Active Transport

Question 5

Define Passsive Transportation:

Answer 5

Requires NO energy/ATP

2 types: Diffusion + Osmosis

Question 6

Define Active Transport:

Answer 6

Requires energy/ATP

1. Na/K Pump
2. Endocytosis
3. Exocytosis

Question 7

Define Diffusion:

Answer 7

A form of passive transport
stimulated by concentration differences

Attempts to evenly distribute molecules

Question 8

The Rate of Diffusion depends on:

Answer 8

Distance: shorter length = faster

Solute Size: smaller molecule= faster

Temperature= higher temp. =faster

Concentration Gradient= more molecules= faster

Question 9

Define Concentration Gradient:

Answer 9

The difference in solute concentration form one area to another

Question 10

The 2 types of Diffusion:

Answer 10

Simple Diffusion

Facilitated Diffusion

Question 11

Define Simple Diffusion:

Answer 11

Molecules that can dissolve in lipids(fats) can esily pass through the Phospholipid bilayer

Question 12

Define Facilitated Diffusion:

Answer 12

Proteins in cell membrane that allow water + water soluble materials to pass through

Question 13

Define Osmosis:

Answer 13

Passive transport, WATER or fluid move ACROSS the cell membrane

Travel from high concentration to low concentration

Osmosis stops when in and out of cell are balanced

Question 14

Define a Aqueous Solution:

Answer 14

Water + a solute

Question 15

Define Osmolarity:

Answer 15

Total solute concentration in a Aqueous Solution

Question 16

When does a cell use Active Transport:

Answer 16

Molecules aren’t lipid-soluble

Molecules are too big to fit through channels

Molecules move against concentration gradient

Question 17

All cell membranes contain carrier proteins called:

Answer 17

Ion Pumps that move ions like NA, K, CA2

Question 18

Define Endocytosis:

Answer 18

Active Transport

The substance is engulfed by a membrane to form a vesicle

Question 19

Define Pinocytosis:

Answer 19

A Cell drinking water to create a vesicle of water

Question 20

Define EXOcytosis:

Answer 20

Substance in a vesicle in cell membrane are ejected from the cell

ex:hormone secretion