BIOL 133 Week 6 Quiz | Assignment Help | APUS
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- 28 Dec 2019
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BIOL 133 Week 6 Quiz | Assignment Help | APUS
Week 6 Quiz
Question 1 of 10
If calcium levels are low, cAMP activity
increases which leads to synthesis and release of parathyroid hormone. cAMP
acts as a(n)
o enzyme
o phosphorylating
agent
o ligand
o second
messenger
Question 2 of 10
________ is the substrate for adenylyl
cylcase.
o GDP
o GTP
o ADP
o cAMP
o ATP
Question 3 of 10
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?
o Extra
genes provide backup in case the original became mutated.
o A
cascade amplifies output from the original signal.
o There
is no benefit – “selfish genes” are often maintained in evolution for reasons
unrelated to the function of their encoded proteins.
o A
cascade is used for timing since it delays the response.
Question 4 of 10
Vibrio fischeri are bioluminescent when
the population reaches a certain size. This is an example of
o population
density
o quorum
sensing
o exponential
growth
o principle
of growth
o binary
fission
Question 5 of 10
Since plants have rigid cell walls formed
from cellulose, transfer of information and materials between cells is
prohibited.
o True
o False
Protein phosphorylating enzymes help
regulated gene expression by
o translation
o DNA
synthesis
o protein
activation
o moving
mRNA into the cytoplasm
Question 7 of 10
Teeth can have a biofilm formed on the
surface. Cell signaling will
o increase
cell quantity
o cause
apoptosis
o cause
increase saliva production
o cause
uncontrolled cell division
Question 8 of 10
Diacylglycerol and inositol triphosphate
are released from phosphatidylinositol biphosphate by ________ .
o adenylyl
cyclase
o phospholipase
C
o protein
kinase C
o G-protein
o A-kinase
Question 9 of 10
What describes transcription factors?
o control
of gene expression
o regulation
of DNA duplication
o ATP
into cAMP
o synthesis
of glycogen
Question 10 of 10
Cell surface receptors have three domains
with different roles. Match each role to the domain that is responsible.
o Hydrophobic
domain
o Cytosolic
domain
o Extracellular
domain
1. Binds the signalling molecule ________
2. Sends conformational change through the
plasma membrane ________
3. Interacts with downstream signalling
cascade ________
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