Membrane Structure and Function

Question 1

Is the plasma membrane semi or selectively permeable?

Answer 1

Selectively

Question 2

What are most abundant in the plasma membrane?

Answer 2

Phospholipids

Question 3

What proteins are bound to the surface of the membrane?

Answer 3

Peripheral proteins

Question 4

What proteins penetrate the hydrophobic core?

Answer 4

Integral Proteins

Question 5

What are the 6 major functions of membrane proteins?

Answer 5

Transport, enzymatic activity, signal transduction, cell-cell recognition, intercellular joining, attachment to cytoskeleton & ECM

Question 6

What proteins allow passage of hydrophilic substances across the membrane?

Answer 6

Transport proteins

Question 7

What allow the passage of water?

Answer 7

Aquaporins

Question 8

What bind to molecules and change shape to shuttle them across the membrane?

Answer 8

Carrier proteins

Question 9

The tendency for molecules to spread out evenly into the available space:

Answer 9

Diffusion

Question 10

Aquaporins and Ion channels are examples of:

Answer 10

Channel proteins

Question 11

What is defined by: the diffusion of water across a selectively permeable membrane?

Answer 11

Osmosis

Question 12

If you have a cell with a greater concentration outside than inside, what tonicity is that cell?

Answer 12

Hypotonic

Question 13

If you have a cell with a greater concentration inside than outside, what tonicity is that cell?

Answer 13

Hypertonic

Question 14

If the concentration is equal both in and outside the cell, what is its tonicity?

Answer 14

Isotonic

Question 15

If the cell is hypotonic to the outside solution, will water move in our out?

Answer 15

Out

Question 16

If the cell is hypertonic to the outside solution, will water move in or out?

Answer 16

In

Question 17

If the cell is isotonic to the outside solution, will the water move in or out?

Answer 17

There is no net movement in the water

Question 18

What type of transport moves substances against the concentration gradient and it requires energy?

Answer 18

Active transport

Question 19

What is the voltage difference across a membrane called?

Answer 19

Membrane potential

Question 20

What is the process where a cell engulfs a particle in a vacuole?

Answer 20

Phagocytosis

Question 21

The process where molecules are taken up when extracellular fluid is gulped into tiny vesicles:

Answer 21

Pinocytosis