BIOLOGY

Question 2 of 10 1.0/ 1.0 Points

Cell surface receptors have three domains with different roles. Match each role to the domain that is responsible.

A. Hydrophobic domain

B. Extracellular domain

C. Cytosolic domain

________________________________________

1. Binds the signaling molecule ________

2. Sends conformational change through the plasma membrane ________

3. Interacts with downstream signaling cascade ________

Question 3 of 10 0.0/ 1.0 Points

If calcium levels are low, cAMP activity increases which leads to synthesis and release of parathyroid hormone. cAMP acts as a(n)

A.enzyme

B.phosphorylating agent

C.ligand

D.second messenger

Question 4 of 10 1.0/ 1.0 Points

Diacylglycerol and inositol triphosphate are released from phosphatidylinositol biphosphate by ________ .

A.adenylyl cyclase

B.phospholipase C

C.protein kinase C

D.G-protein

E.A-kinase

Question 5 of 10 1.0/ 1.0 Points

________ is the substrate for adenylyl cylcase.

A.GDP

B.cAMP

C.ADP

D.GTP

E.ATP

Question 6 of 10 0.0/ 1.0 Points

Protein phosphorylating enzymes help regulated gene expression by

A.moving mRNA into the cytoplasm

B.translation

C.DNA synthesis

D.protein activation

Question 7 of 10 1.0/ 1.0 Points

A common theme in many pathways is a cascade of similar enzymes acting on each other in sequence. For instance, MAP kinase kinase kinase adds a phosphate to MAP kinase kinase, which adds phosphate to MAP kinase, which adds phosphate to another substrate.

What is the benefit of using a cascade of enzymes?

A.Extra genes provide backup in case the original became mutated.

B.A cascade amplifies output from the original signal.

C.There is no benefit – “selfish genes” are often maintained in evolution for reasons unrelated to the function of their encoded proteins.

D.A cascade is used for timing since it delays the response.

Question 8 of 10 1.0/ 1.0 Points

Vibrio fischeri are bioluminescent when the population reaches a certain size. This is an example of

A.population density

B.quorum sensing

C.exponential growth

D.principle of growth

E.binary fission

Question 9 of 10 1.0/ 1.0 Points

Since plants have rigid cell walls formed from cellulose, transfer of information and materials between cells is prohibited.

True

False

Question 10 of 10 1.0/ 1.0 Points

Teeth can have a biofilm formed on the surface. Cell signaling will

A.increase cell quantity

B.cause increase saliva production

C.cause apoptosis

D.cause uncontrolled cell division

!

Chapter 10- wk 7

Return to Assessment List

Part 1 of 1 – 9.0/ 10.0 Points

Question 1 of 10 1.0/ 1.0 Points

Which molecule initiates the halt of the cycle when damaged DNA is detected in G1?

A.Rb

B.p53

C.Cdk/cyclin complex

D.p21

E.E2F

Question 2 of 10 0.5/ 1.0 Points

In which type of human cell(s) would 46 chromosomes be located? Select all that apply.

A. diploid

B. egg

C. somatic

D. gamete

E. sperm

F. haploid

Question 3 of 10 1.0/ 1.0 Points

If there are 8 centromeres in metaphase, how many centromeres will be present in anaphase?

A.4

B.8

C.16

D.32

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