Transport

Question 1

Characteristics of channel proteins

Answer 1

Formed water filled holes through the cell membrane
Molecules move by diffusion along a concentration gradient
Opening and closing of channels is controlled
Movement through channels cannot be saturated

Question 2

Characteristics of carrier proteins

Answer 2

Interact with the molecule being moved and facilitates it
Can become saturated
May or may not move multiple molecules simulataneously
Movement if molecules can be passive or active

Question 3

Types of passive transport

Answer 3

Simple diffusion, osmosis, faciliatated diffusion

Question 4

Main difference between simple and facilitated diffusion is

Answer 4

Faciliated diffusion is used in thetransport of large substances like glucose and amino acids

Question 5

Which substances move through channel proteins

Answer 5

Electrically charged substances because they re charged and will face electrostatic interaction from polar head

Question 6

What is faciliatated diffusion?

Answer 6

Facilitated diffusion is the diffusion of specific molecules through transport proteins found in the membrane

Question 7

Nb

There are carrier proteins at each end of transport membrane proteins

Answer 7

..

Question 8

What is the renal …

Answer 8

Concentration if glucose at which kidney will exceed transport maximum

Question 9

What is an osmole

Answer 9

Number of osmotically active molecules in a solution

Question 10

Hyperosmotic solution

Answer 10

Solution whose osmotic strength is higher than that of another solution

Question 11

What is the difference between primary active transport and secondary active transport

Answer 11

With primary active transport, energy is used directly from ATP. With secondary active transport, energy is used indirectly

Question 12

Osmotic pressure does not depend in the size or mass or chemical nature of molecule but

Answer 12

Specific gravity:weight of solution divided by the weight of a equal volume of distilled water

Question 13

Osmotic pressure and osmotic pressure

Answer 13

Magnitude of opposing pressure necessary to just stop osmosis

Osmotic pressure exerted by a bigger molecule(protein)

Question 14

What are the types of active transport

Answer 14

Endocytosis
Exocytosis
Protein pumps

Question 15

What is the function of sodium potassium pump

Answer 15

The sodium-potassium pump moves K+ into the cell while moving Na+ at a ratio of three Na+ for every two K+ ions.

Question 16

Describe the action of sodium potassium atp ase

Answer 16

When the sodium-potassium- ATPase enzyme points into the cell, it has a high affinity for sodium ions and binds three of them, hydrolyzing ATP and changing shape.

As the enzyme changes shape, it reorients itself towards the outside of the cell, and the three sodium ions are released.

The enzyme’s new shape allows two potassium to bind and the phosphate group to detach, and the carrier protein repositions itself towards the interior of the cell.

The enzyme changes shape again, releasing the potassium ions into the cell.

After potassium is released into the cell, the enzyme binds three sodium ions, which starts the process over again.