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)
Question 4 of 10 1.0/ 1.0 Points
Diacylglycerol and inositol triphosphate are released from phosphatidylinositol biphosphate by ________ .
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
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
D.principle of growth
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
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?
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.