Chapter 5

Question 1

Separates the cell from surroundings- separates inside from outside of cell.

Answer 1

Cell Membrane

Question 2

Allowing om substances to cross it more easily than others. Cells chooses who (the molecules) gets in and out of cell.

Answer 2

Selective permeability

Question 3

What are cell membranes made out of?

Answer 3

Phospholipids

Question 4

Are amphipathic molecules

Answer 4

Phospholipids

Question 5

Of amphipathic molecules what part are lipids/heads? what are the tails?

Answer 5

Lipids/heads: hydrophilic
Tails: hydrophobic
They can switch places

Question 6

In the phospholipid bilayer (2 layers)
what is inside the cell?

Answer 6

Cytoplasm

Question 7

Of the cell membrane, Phospholipid bilayer have:

Answer 7

-Fluid
- Is Viscous
- Cholesterol

Question 8

What of the cell membrane phospholipid bilayer has unsaturated tails that prevent packing?

Answer 8

Fluid

Question 9

What of the cell membrane phospholipid bilayer has saturated tails packed together?

Answer 9

Viscous

Question 10

What of the cell membrane phospholipid bilayer reduces membrane fluidity at moderate temperatures hindering solidification?

Answer 10

Cholesterol

Question 11

Go all the way through the membrane. Penetrate the hydrophobic interior of the lipid bilayer.

Answer 11

Integral Proteins

Question 12

Are loosely bound to the surface of the membrane.

Answer 12

Peripheral Proteins

Question 13

Transport, enzymatic activity, attachment, cell-cell recognition, intercellular joining, signal transduction.

Answer 13

Proteins

Question 14

Process of Transport of Proteins:

Answer 14

1.) Transport
2.) Enzymatic Activity
3.) Attachment to the Cytoskeleton and extracellular matric (ECM)
4.) Cell-cell recognition
5.) Intracellular joining
6.) Signal transduction

Question 15

Act like little name tags. Cells recognize each other by binding to these.

Answer 15

Carbohydrates

Question 16

Happens naturally, no energy is required

Answer 16

Passive Transport

Question 17

Function of Cell Membrane. Movement of particles from high to low concentration. Passive, requires no energy

Answer 17

Passive Transport

Question 18

Diffusion of water across a selectively permeable membrane. Water diffuses across a membrane from region of lower solute concentration to region of higher solute concentration until solute concentration is equal.

Answer 18

Osmosis

Question 19

No energy (ATP) required

Answer 19

Passive Transport

Question 20

Move molecules of solute high to low concentration

Answer 20

Diffusion

Question 21

Movement of water (H2O). Way to balance solute concentration

Answer 21

Osmosis

Question 22

Solute concentration is the same inside and outside of cell

Answer 22

Isotonic

Question 23

Solute concentration is greater

Answer 23

Hypertonic

Question 24

Solute concentration is less.

Answer 24

Hypotonic

Question 25

Molecules in and Out of Cell:

Answer 25

1.) Passive Transport A.) Diffusion B.) Osmosis

Question 26

Diffusion:

Answer 26

a.) simple diffusion b.) facilitated diffusion i.) channel proteins ii.) carrier proteins

Question 27

molecules pass through membrane

Answer 27

simple diffusion

Question 28

Transport proteins use to passively move molecules across the plasma membrane.

Answer 28

Facilitated diffusion

Question 29

Open passageway for molecule to get through. Provide corridors that allow a specific molecule or ion to cross the membrane.

Answer 29

channel proteins

Question 30

carry molecules across membrane and he protein has to have a shape or confirmation change. Undergo a certain change in shape that translocates the solute-binding site across the membrane.

Answer 30

Carrier proteins

Question 31

Move substances against their concentration gradients, requires energy (ATP). Low to high, against the concentration gradient.

Answer 31

Active Transport

Question 32

Occurs when active transport of a solute indirectly drives transport of other solutes

Answer 32

Cotransport

Question 33

Help get big things in and out of cell.

Answer 33

Bulk Transport

Question 34

What 2 things are apart of Bulk Transport?

Answer 34

Exocytosis and Endocytosis

Question 35

Vesicles move to membrane, fuse with it, and release their contents outside of cell

Answer 35

Exocytosis Exo=out cyto=cell

Question 36

Cell takes in molecules by forming new vesicles from the plasma membrane.

Answer 36

Endocytosis Endo=inside cyto=cell