BIOLOGY

Chapter 9- wk 6

 

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Part 1 of 1 –         7.0/ 10.0 Points

 

 

 

Question 1 of 10               0.0/ 1.0 Points

 

What describes transcription factors?

 

 

 

A.control of gene expression

 

 

 

B.regulation of DNA duplication

 

C.ATP into cAMP

 

 

 

D.synthesis of glycogen

 

 

 

 

 

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

 

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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

 

 

 

 

 

 

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