#Question id: 1740
#Unit 4. Cell Communication and Cell Signaling
Activation of resting B-cells by T-helper cells depends directly upon costimulatory interaction between:
#Question id: 10867
#Unit 10. Ecological Principles
Plants that inhabit stable environments tend to produce ________ seeds.
#Question id: 7309
#Unit 5. Developmental Biology
Following statements are regarding to the molecular basis of the coincidence model in Arabidopsis.
A.
In Arabidopsis under short days, there is little overlap between CO mRNA
expression and daylight.
B.
CO protein does not accumulate to sufficient levels in the phloem to promote
the expression of the transmissible floral stimulus and the plant remains vegetative.
C. Under long days, the peak of CO mRNA abundance (at hours 12 through 16) overlaps with daylight (sensed by phyA and cryptochrome [cry]), allowing CO protein to accumulate.
D. CO activates FLC mRNA expression in the phloem, which
causes flowering when the FT protein is translocated to the apical meristem.
Which of the following is incorrect?
#Question id: 12748
#Unit 13. Methods in Biology
#Question id: 73
#Unit 1. Molecules and their Interaction Relevant to Biology
Match the Variation of Reaction Spontaneity (Sign of ΔG) given in Column I with the Signs of ΔH and ΔS given in column II.
|
COLUMN I |
COLUMN II |
|
|
|
|
ΔH |
ΔS |
ΔG = ΔH – TΔS |
|
1. |
− |
+ |
a. The
reaction is both enthalpically and entropically opposed. It is nonspontaneous
(endergonic) at all temperatures. |
|
2. |
− |
− |
b. The
reaction is enthalpically opposed (endothermic) but entropically favored. It
is spontaneous only at temperatures above T = ΔH/ΔS. |
|
3. |
+ |
+ |
c. The
reaction is enthalpically favored but entropically opposed. It is spontaneous
only at temperatures below T = ΔH/ΔS. |
|
4. |
+ |
− |
d. The
reaction is both enthalpically favored (exothermic) and entropically favored.
It is spontaneous (exergonic) at all temperatures. |