Exam #3 (Lectures #13-)

Question 1

Diffusion

Answer 1

the movement of molecules across a selective barrier

Question 2

Osmosis

Answer 2

the diffusion of water molecules across a selective barrier from high to low concentration

Question 3

Selective (semi-permeable) barrier

Answer 3

allows water molecules to pass through, but not most of the molecules dissolved in the water
(plasma membrane)

Question 4

Solutes

Answer 4

molecules that are dissolved in water

Question 5

What is the concentration of water is determined by?

Answer 5

The concentration of solutes in the water

Question 6

Solute potential (Psy sub s)

Answer 6

a measure of the concentration of solutes dissolved in water

Pure water- has no solute (highest value)

Question 7

When are water molecules most concentrated?

Answer 7

Psy sub s= 0

Question 8

Adenosine monophosphate (AMP)

Answer 8

• 1 phosphate group
• Lowest G state

Question 9

Adenosine diphosphate (ADP)

Answer 9

• 2 phosphate groups
• Contains lots of free energy
• Lower G state

Question 10

Adenosine triphosphate (ATP)

Answer 10

• 3 phosphate groups
• Contains lots of free energy
• Highest G state

Question 11

Hydrolysis of ATP to ADP

Answer 11

Energy is released

Question 12

ATP synthesis

Answer 12

Endergonic

• Requires energy
• Energy comes from exergonic cellular reactions

Question 13

ATP hydrolysis

Answer 13

Exergonic
- Releases energy
- Energy for endergonic cellular processes