Biology: Cell Communication Chapter 9 set 2 Flashcards


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created 10 years ago by kathy_holleman
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Biology
Chapter 9
biology 1406, Summer, Dr. Kirk, Test 4
Grade levels:
College: First year
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1

Which of the following statements about steroid receptors is FALSE?

The receptors are localized to the plasma membrane.

2

Which of the following receptor and signal transduction molecules are mismatched?

steroid receptor: calcium

3

When assembling a fish aquarium one must add a conditioner to the water that contains bacteria capable of metabolizing fish waste such as ammonia, nitrate, and nitrite that accumulates in the aquaria water. Which of the following components of signal reception and transduction is NOT required for the bacterial two-component regulatory system for metabolizing these nitrogenous waste products?

ligand-gated calcium channel

4

Which of the following is capable of dephosphorylating molecules?

Grb2/Sos/Ras complex

5

Adenylyl cyclase is to cAMP as ________ is to IP3

phospholipase C

6

Which of the following is LEAST likely involved in calcium signaling?

protein kinase A

7

Estrogen is most likely to exert its effects by regulating

expression of genes and production of specific proteins.

8

What do enzyme-linked receptors and growth factor receptors have in common?

Both possess kinase activity when bound to a hormone

9

Which of the following represents the correct sequence of events in the cAMP signal transduction pathway?

G proteinadenylyl cyclasecAMPprotein kinase Acell response

10

A hormone binds a receptor and activates the cAMP signal transduction pathway ultimately leading to the cell response. Which of the following is NOT a likely mechanism for reversing (or shutting off) cAMP transduction?

Activate adenylyl cyclase.

11

Which molecule is directly responsible for breaking down cAMP to inactive AMP?

phosphodiesterase

12

The production of second messengers in signal transduction offers at least two advantages, speed and

amplification.

13

What type of receptor does IP3 bind?

ligand-gated Ca2+ channel

14

Phospholipase C hydrolyzes a membrane phospholipid to produce

both IP3 and diacylglycerol.

15

All of the following are general components of the growth factor signaling pathway EXCEPT

IP3 and Ca2+.

16

Which of the following is not an effect of epinephrine throughout the body?

The body's ability to digest a large meal

17

Various cells in the body respond to the hormone epinephrine in various ways due to _____.

differential gene regulation

18

Which of the following is NOT an example of how differential gene regulation affects cellular response?

Cell junctions passing ions between the cytosol of one cell to another cell.

19

Programmed cell death is known as ____.

apoptosis