Transport Across Cell Membrane

Question 1

Homeostasis

Answer 1

Maintenance of normal internal conditions of a cell

Question 2

Plasma membrane (made up of)

Answer 2

Phospholipids

Question 3

Fluid mosaic model

Answer 3

Model for the plasma membrane based on the changing location and pattern of protein molecules in the phopholioid bilayer

Question 4

Channel proteins

Answer 4

Passage of molecules through the membrane

Question 5

Carrier protein

Answer 5

Passage of molecules through the membrane, combine with a substance and help it move across

Question 6

Selectively permeable

Answer 6

Certain substances can move across the membrane while others can’t

Question 7

Concentration gradient

Answer 7

Move from area of high concentration to low concentration

Question 8

Diffusion

Answer 8

Goes toward lower concentration

Requires a concentration gradient

Requires no energy

Question 9

Facilitated transport

Answer 9

Towards lower concentration

Requires a channel or carrier and concentration gradient

No energy

Question 10

Active transport

Answer 10

Toward high concentration

Requires a carrier protein

Needs energy

Question 11

Exocytosis

Answer 11

Towards outside

Requires Vesicles fuses with plasma membrane

Energy!!!

Question 12

Endocytosis

Answer 12

Towards inside

Requires vesicles formation

Needs energy!!

Question 13

Diffusion (define)

Answer 13

Movement of molecules from a higher to lower concentration

Question 14

Osmosis

Answer 14

Diffusion of water across a selectively permeable membrane

Question 15

Osmotic pressure

Answer 15

Pressure what develops in a system due to osmosis

Question 16

Isotonic solitons

Answer 16

The concentration of the inside and outside are equal!

Question 17

Hypotonic solution

Answer 17

Solutions that cause cells to swell or even burst

Lower concentration of solute then inside

Question 18

Hypertonic

Answer 18

Cause cells to shrink or shrivel due to loss of water

More concentration on outside then inside

Question 19

Facilitated substance

Answer 19

Transfer of a substance into or out of a cell along a concentration gradient

Uses a carrier protein

Question 20

Active transport

Answer 20

Moving a molecule from a lower concentration to a higher concentration

Uses carrier protein

Uses energy

Question 21

Endocytosis

Answer 21

Vehicle fuses with the plasma membrane as secretion occurs

Question 22

Endocytosis

Answer 22

Cells take in substances by vesicles formation

Question 23

Phagocytosis

Answer 23

When material taken in by endocytosis is large

Question 24

Pinocytosis

Answer 24

Vesicles form around liquid or small particles