Week 1 - Cell Membrane Transport

Question 1

Homeostasis is continually being disrupted by ____ and _____ stimuli, examples of which include _____

Answer 1

external
internal
heat, cold, lack of oxygen
psychological stress, exercise

Question 2

The body maintaines homeostasis by influencing which organ system(s)?

Answer 2

nervous

endocrine

Question 3

The components of a feedback loop are ________

Answer 3

receptor
control center
effector

Question 4

In a negative feedback loop, the original stimulus is ______

Answer 4

reversed

Question 5

In a positive feedback loop, the original stimulus is _______ and requires an additional ________

Answer 5

intensified

control mechanism

Question 6

The lipid bilayer of the cell membrane consists of _________

Answer 6

phospholipids
cholesterol
integral proteins
glycolipids
peripheral proteins

Question 7

List functions of membrane proteins

Answer 7

Formation of channel
transporter protein
receptor protein
cell identity marker
linker
act as enzyme

Question 8

Fluidity of the cell membrane is reduced by presence of ________

Answer 8

cholesterol

Question 9

List types of transport across plasma membrane

Answer 9

mediated transport
non-mediated transport
active transport
passive transport
vesicular transport

Question 10

How will each of the following affect rate of diffusion:

1) Higher temperature
2) larger size of diffusing substance
3) increase in surface area
4) increasing diffusion distance
5) lower concentration gradient

Answer 10

1) faster
2) slower
3) faster
4) slower
5) slower

Question 11

Osmosis is _______

Answer 11

the net movement of water through a selectively permeable membrane from an area of high water concentration to an area of lower water concentration

Question 12

In a ____ solution, higher concentration of water outside of the cell results in hemolysis

Answer 12

Hypotonic

Question 13

In a ____, solution, lower concentration of water outside of the cell results in _____

Answer 13

Hypertonic

crenation

Question 14

List modes of passive transport across cell membrane

Answer 14

diffusion through lipid bilayer
diffusion through membrane channel
facilitated diffusion

Question 15

40% of ATP in a cell is used for ________

Answer 15

primary active transport

Question 16

Secondary active transport is ______

Answer 16

a type of active transport where a transporter protein couples the movement of an ion (typically Na+ or H+) down its electrochemical gradient to the uphill movement of another molecule or ion against a concentration/electrochemical gradient

Question 17

What is pinocytosis?

Answer 17

a mode of endocytosis in which small particles, primarily extracellular fluids, are brought into the cell, forming an invagination, and then suspended within small vesicles

Question 18

Cells that are active in exocytosis would likely contain many ______ (organelle)

Answer 18

Golgi bodies

Question 19

Transport proteins w/in the cell membrane are required to transport a substance across a membrane via ______

Answer 19

facilitated diffusion