#Question id: 4400
#Unit 3. Fundamental Processes
Which is the first factor to bind at the promoter of eukaryotic genes?
a. RNA polymerase
b. TFIIA
c. TFIIB
d. TFIID
e. TATA box–binding protein
#Question id: 31139
#Unit 2. Cellular Organization
#Question id: 1230
#Unit 4. Cell Communication and Cell Signaling
Which of the following events occur(s) following the binding of a ligand to a G protein–coupled receptor that triggers release of Ca2+?
a. activation of protein kinase A by IP3
b. phospholipase cleavage of PIP2 to IP3 and DAG
c. release of DAG into the cytosol
d. IP3-mediated opening of Ca2+ channels in the ER membrane
#Question id: 7242
#Unit 5. Developmental Biology
The
cells of posterior marginal zone act as
the equivalent of the amphibian Nieuwkoop center because:
A.
once the PMZ has formed, it controls the other regions of the margin.
B.
Cells of PMZ initiate other regions of the margin from forming their own
primitive streaks.
C.
the entire marginal zone produces Wnt8c (capable of inducing the accumulation
of -catenin) and secrete Vg1, a member of the TGF-family.
D.
The PMZ cells secretes nodal protein and Nodal activity is needed to initiate
the primitive streak.
E.
When placed in the anterior region of the marginal zone, a graft of PMZ tissue
(posterior to and including Koller’s sickle) is able to induce wnt signaling.
Which of the following option is correct?
#Question id: 10422
#Unit 6. System Physiology – Plant