Chapter 4

Question 1

Functions

Answer 1

Controls what enters and exits the cell to maintain internal balance

Question 2

Lipid bilayer

Answer 2

2 layers

Question 3

Selectively permeable

Answer 3

Cell membranes allows some molecules in and keeps other molecules out.

Question 4

Passive transport

Answer 4

Doesn’t use energy

Question 5

Active transport

Answer 5

Used energy

Question 6

Diffusion

Answer 6

Random movement of particles from high to low concentration until all molecules are evenly spaced

Question 7

Facilitated diffusion

Answer 7

Specific particles though transport proteins found in the membrane

Question 8

Osmosis

Answer 8

Water moves from high to low concentration

Question 9

HypOtonic

Answer 9

Low to high

Water moves from the solution to inside the cell. Cell swells and bursts open (cytolysis)

Question 10

HypERtonic

Answer 10

High to low

Water moves from inside the cell into the solution: Cell shrinks (Plasmolysis)

Question 11

Isotonic

Answer 11

Equal concentration for both inside and outside

Question 12

Concentration gradient

Answer 12

When two concentrations of a substance are separated by a barrier

Question 13

Homeostasis

Answer 13

Processes that keep internal systems in balance when external conditions keep changing

Question 14

Qualitative observations

Answer 14

Observations that involve descriptions; observations that are relative or subjective

Question 15

Organelle

Answer 15

Compartment within cells that perform specific functions

Question 16

Variables

Answer 16

All factors that might affect the outcome of an experiment

Question 17

Control

Answer 17

The normal condition or specimen in an experiment that has not been altered

Question 18

Stressors

Answer 18

Things that can cause disruptions in homeostasis

Question 19

Quantitative observations

Answer 19

Observations that can be measured

Question 20

Solution

Answer 20

Uniform mixture of two or more substances