#Question id: 1253
#Unit 4. Cell Communication and Cell Signaling
Following statements are regarding to the wnt signalling.
A. Wnt proteins interact with several cell-surface proteins and activate multiple downstream signal transduction pathways. The principal signaling receptor for Wnt proteins is Frizzled (Fz), which contains seven transmembrane α helices.
B. The palmitate attached to the Wnt protein binds to a specific site on the Fz intracellular domain and stabilizes the Wnt-Fz complex.
C. “canonical” Wnt signaling pathway uses a second transmembrane protein, LRP, that associates with Frizzled in a Wnt signal– dependent manner.
D. In the resting state, two kinases in the complex, casein kinase 1 (CK1) and GSK3, sequentially phosphorylate β-catenin on multiple tyrosine residues.
Which of the following statements are correct?
#Question id: 428
#Unit 1. Molecules and their Interaction Relevant to Biology
The most biochemically complex organisms are ________.
#Question id: 10970
#Unit 7. System Physiology – Animal
A mother of blood type A+ who has always been perfectly healthy just delivered her second child. The father is of blood group O−. Knowing that the child is of blood group O− (O, Rh−), what would you expect to find in this child?
#Question id: 10490
#Unit 6. System Physiology – Plant
Which of the following is a correct Match of the stomatal opening and closing mechanism;
COLUMN A
COLUMN B
P-
Opening of Stomata i) Chloride anions are taken up into the
guard cells from the apoplast
Q- Closing of stomata ii)
The malate content of guard cells decreases
iii) starch content in
guard cells increases during end of the
iv)
Acidification of the lumen stimulates zeaxanthin formation which activates the
H+ ATPase causing
v) Accumulation of solute in vacuole such as sucrose and malate leads to
#Question id: 23837
#Unit 2. Cellular Organization