Unit 3: Cell Membranes Flashcards Preview

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Flashcards in Unit 3: Cell Membranes Deck (18):
1

Factors that affect fluidity

Temp
Cholesterol
Length of fatty acids
Degree of saturation

2

Diffusion

The tendency for particles of any kind to spread out evenly in an available space, moving from more concentrated regions to less

3

What type of proteins are involved with cell-cell recognition?

Glycoproteins

4

What are intergrins and what do they do?

It a membrane protein
Span the membrane and give it a stronger framework

5

How does diffusion happen in our lungs

It allows for oxygen to enter red blood cells and for co2 to leave them

6

What kind of cells need help from _____to move across the cell membrane?

Polar and charged ions need transport proteins

7

Tonicity

The ability of a solution to cause a cell to gain or lose water

8

What does tonicity depend on?

The concentration of solute that cannot cross the plasma membrane

9

What happens to an animal cell in an isotonic solution?

The cells volume remains consistent Bc water is entering and exiting the cell at the same rate

10

What happens to an animal cell in a hypotonic solution

The cell has the potential to burst as more water flows into it

11

What happens to an animal cell in a hypertonic solution

The cell can shrivel up and die without enough water flowing into it (crenation)

12

What happens to plant cells in an isotonic solution?

The cell becomes flaccid without enough water to put pressure on the cell wall

13

What happens to the plant cell in a hypotonic solution

The cell wall becomes turgid as water flows into the cell

14

What happens to a plant cell in a hypertonic solution

The cell wall shrivels and the cell does too as water leaves the cell, plasmolysis

15

What is facilitated diffusion and what does it not require

When a protein helps a cell move down its concentration gradient... It doesn't require energy

16

1st law of thermodynamics

The total energy of an isolated system is constant

17

2nd law of thermodynamics

The total entropy of a system will always go up

18

Role of cholesterol in the cell membrane

Regulates fluidity