#Question id: 1094
#Unit 4. Cell Communication and Cell Signaling
Not all intercellular signals require transduction. Which one of the following signals would be processed without transduction?
#Question id: 1056
#Unit 4. Cell Communication and Cell Signaling
During penetration of E. coli by the T4 phage
#Question id: 2922
#Unit 2. Cellular Organization
Human genes/proteins that regulate the cell cycle are most easily isolated by:
#Question id: 16121
#Unit 7. System Physiology – Animal
Match the following mechanisms (Column I) with their correct example (Column II).
|
Column I |
Column II |
|
A. Heat-generating and heat-retaining mechanisms |
i. increased metabolic rate (thyroid hormones, sympathetic nervous system) |
|
B. Heat-dissipating mechanisms |
ii. vasodilation of blood vessels of the skin
(decreased sympathetic tone) |
|
|
iii. increased activity of sympathetic cholinergic
fibers to sweat glands. |
|
|
iv. shivering |
|
|
v. vasoconstriction of blood vessels of the skin (increased
sympathetic tone) |
#Question id: 1259
#Unit 4. Cell Communication and Cell Signaling
Following statements are regarding to the phosphoinositide pathway.
A. many activated RTKs and cytokine receptors initiate phosphoinositide pathway by recruiting the enzyme phosphatidylinositol-3 kinase (PI-3 kinase) to the membrane.
B. PI-3 kinase adds a phosphate to the 3′ carbon in one of two separate phosphatidylinositol substrates, leading to formation of two phosphatidylinositol 3-phosphates: PI(3,4)P2 or I(3,4,5)P3
C. PI-3 kinase pathway can trigger cell division and prevent apoptosis, thus ensuring cell survival by the activation of PKB.
D. Activated PKB phosphorylates FOXO3a, which induces the expression of several antiapoptotic genes.
Which of the following combination is correct?