1 Which of the following is FALSE about channel proteins? a. transfers molecules
ID: 88920 • Letter: 1
Question
1 Which of the following is FALSE about channel proteins?
a.
transfers molecules one at a time by changing conformation
b.
binds with greatest specificity of all membrane transport proteins
c.
small charged molecules can travel through
d.
A & B
e.
A & C
2. Provides energy and acts as cell surface marker
a.
Phosphatidylserine
b.
Glycolipids
c.
Inositol phospholipids
d.
Spingomyelin
3. How can proteins cross a phospholipid bilayer?
a.
transport vesicles
b.
nuclear pores
c.
protein translocators
d.
A & B
e.
all of the above
4. How does cholesterol in animal cell membranes affect the fluidity of the bilayer?
a.
Cholesterol tends to stiffen the bilayer
b.
Cholesterol tends to make the bilayer more fluid
c.
Cholesterol has little effect on membrane fluidity
d.
A & B
5. In mammalian cells, how many Na+ molecules are transferred out of a cell and how many K+ molecules are transferred into a cell?
a.
Both molecules travel freely in and out of the cell
b.
3 Na+ and 2 K+
c.
1 Na+ and 2 K+
d.
2 Na+ and 3 K+
e.
2 Na+ and 1 K+
6. Which of the following is NOT an extracellular signal used to control arrangement of actin filaments?
a.
Cdc7
b.
Surplus of Ca2+
c.
Rac activation
d.
A & B
e.
B & C
a.
transfers molecules one at a time by changing conformation
b.
binds with greatest specificity of all membrane transport proteins
c.
small charged molecules can travel through
d.
A & B
e.
A & C
Explanation / Answer
1.Correct answer is: a.transfers molecules one at a time by changing conformation.
Reason: Millions of molecules can pass at a time through channel proteins .
2.Correct answer is: b.Glycolipids
Reason:Glycolipids is the best fit for the answer.
3.Correct answer is: e.all of the above
Reason:It is through all of the above means by which protein can cross the phispholipid bilayer.
4.Correct answer is:d.A & B
Reason:Cholesterol serves both the functions as mentioned.
5.Correct answer is: b.3 Na+ and 2 K+
Reason:For every 3Na+ pumped out of the cell. 2K+ ions go into the cell.
6.Correct answer is : a.cdc7
Reason:cdc7 is an enzyme that participates in the regulation of the cell cycle but not in activation of actin filaments.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.