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)


B.phosphorylating agent


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



Question 5 of 10 1.0/ 1.0 Points

________ is the substrate for adenylyl cylcase.






Question 6 of 10 0.0/ 1.0 Points

Protein phosphorylating enzymes help regulated gene expression by

A.moving mRNA into the cytoplasm


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.



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?



C.Cdk/cyclin complex



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?





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