Chapter 5 Text Book Questions

Question 1

In What way do the membranes of a eukaryotic cell vary?

Answer 1

Certain proteins are unique to each kind of membrane

Question 2

Which of the following would increase membrane fluidity?
Greater proportion of uns phospholipids
A greater proportion of sat phospholipids
A lower temp
A relatively high protein content in the membrane

Answer 2

Greater proportion of uns phospholipids

Question 3

Phophorylation cascades involving a series of protein kinases are useful for cellular singal transduction because

Answer 3

They amplify the original signal manyfold

Question 4

Lipid soluble signaling molecules such as aldosterone cross the membranes of all cells but affect only target cells because

Answer 4

Intracellular recepters are present only in target cells

Question 5

Which of the following processes includes the others?
Osmosis
Diffusion of a solute across a membrane
Passive transport
Transport of an ion down its electrochemical gradient

Answer 5

Passive Transport

Question 6

Which of thse experimental treatments would increase the rate of surcrose transport into a plant cell?

Answer 6

Decreasing extracellular pH