Science : Dynamic cells

Question 1

What does it mean to be “hydrophobic”?

Answer 1

Water hating.

Question 2

What does it mean to be “hydrophilic”?

Answer 2

Water loving.

Question 3

Why do the heads of phospholipids tend to be attracted to water?

Answer 3

They are polar + water is polar.

Question 4

How do hydrophilic heads and hydrophobic tails result in the formation of a phospholipid bilayer cell membrane?

Answer 4

Arrange themselves so that both ends will be happy.
- Hydrophilic near water
- Hydrophobic away from water

Question 5

Why do the phospholipids line themselves up into a “bilayer” configuration?

Answer 5

There is water inside and outside the cell membrane. They line up b/c of attraction or repulsion to water.

Question 6

Why are cell membranes considered to be “fuild”?

Answer 6

• The embedded parts are able to move within the bilayer
• They are semi-permeable to prevent or allow substances to move through (ie, nutrients in, waste out)

Question 7

What does “mosaic” mean? How does this concept apply to cell membranes?

Answer 7

• Structured with carbohydrates embedded in the bilayer used for a cell to cell communication.
• Several types of proteins are embedded to allow some substances to enter or leave the cell.

Question 8

What are the carbohydrates embedded in the phospholipid bilayer used for?

Answer 8

Used for cell-to-cell communication.

Question 9

What are the purposes of the proteins embedded in the phospholipid bilayer?

Answer 9

Passayer ways for into + out of cells.

Question 10

What three important functions do cell membranes perform for the cell?

Answer 10

a. Prevent many substances from entering (or leaving) the cell by providing a semi-permeable barrier
b. Organize the space inside the cells into smaller compartments (called organelles), this helps keep chemicals together for needed reactions to occur and helps to stop unwanted reactions from happening.
c. Allow substances that the cell needs to enter the cell, and waste to leave the cell.

Question 11

Cells need to maintain a stable environment. This is called ___.

Answer 11

Homeostasis

Question 12

Living things use a molecule called ___ to give energy to cellular processes.

Answer 12

ATP

Question 13

What is a solution?

Answer 13

The combination of the solute and solvent.

Question 14

In a solution, the solute is:

Answer 14

The substance being dissolved (ex, salt, sugar, coffee)

Question 15

In a solution, the solvent is:

Answer 15

The dissolver (ex, water)

Question 16

What is the word when particles even out to reach a state of ___?

Answer 16

Equilibrium

Question 17

What are the three types of passive transport?

Answer 17

1. Diffusion
2. Osmosis
3. Facilitated diffusion

Question 18

Hypertonic solution

Answer 18

The concentration of solute is higher in the solution than in the cell. Water moves from the cell to the solution.

Question 19

Hypotonic solution

Answer 19

The concentration of the solute is lower in the solution than in the cell. Water moves from the cell to the solution.

Question 20

Isotonic solution

Answer 20

The concentration of solute is equal in the solution as in the cell. Water stays or equal amount moving in and out.