QUESTION 1 Which of the following molecules would you most expect to function as
ID: 3166976 • Letter: Q
Question
QUESTION 1
Which of the following molecules would you most expect to function as a ligand for an intracellular receptor?
a small hydrophobic molecule.
a small hydrophilic molecule.
a large hydrophobic molecule.
a large hydrophilic molecule
It's impossible to make such a prediction.
QUESTION 2
The following type of protein acts to turn on/off signaling by removing phosphate groups from tyrosines:
phosphatase
kinase
protease
nuclease
QUESTION 3
Proteins have different parts, or domains, that have different functions. What is the function of an SH2 domain?
Binds to a phosphorylated tyrosine on itself
Binds to a phosphorylated tyrosine on a different protein
binds to a proline rich sequence in another protein
Binds to a kinase
QUESTION 4
Which of the following mutations to a G protein would result in a signaling pathway that can not be activated?
G protein that cannot bind to its GAP
G protein that cannot hydrolyze GTP
G protein that cannot release GDP
G protein that has a higher affinity for GTP
both a and c
a.a small hydrophobic molecule.
b.a small hydrophilic molecule.
c.a large hydrophobic molecule.
d.a large hydrophilic molecule
e.It's impossible to make such a prediction.
Explanation / Answer
Question 1 :
Option A since hydrophobic molecules are able to cross membranes and those smaller in size . Hydrophilic and large molecules are not allowed to cross the membranes.
2nd ques : A phosphatase , Kinases add whereas phosphatases remove phosphate.
3rd ques : option C It allows to dock to phosphorylated tyrosines of other proteins.
4th ques : Option C
Since when a g protein is activated , gdp which binds to g protein in inactivated state is exchanged by gtp. Further GAP ( gtpase activating protein ) hydrolyses gtp to gdp terminating the action . so clearly the answer is C
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