Some given statements about  the cytokinin signalling pathway;

a)  Cytokinin receptor CRE1 probably functions as a monomer

b) Two other hybrid sensor kinases (AHK2 and AHK3) may also act as cytokinin receptors in Arabidopsis

c) Activated receptor activates their histidine kinase activity, The phosphate is transferred to an aspartate residue (D) on the fused receiver domains

d) The phosphate is then transferred to a conserved histidine present in an AHP protein that transfer the phosphate to an aspartate residue  located within the receiver domain of type-B ARRs only

e) The phosphorylation of the type-B ARR activates the output domain to induce transcription of genes encoding type-A ARRs.

f) The phosphorylated type-A ARRs feed back to negatively regulate cytokinin signaling, thus dampening cytokinin responses

Which of the following are the correct prediction about cytokinin signalling?

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#Question id: 17656

#Unit 7. System Physiology – Animal

The body is too worn down to deal with the stress and leaves the body vulnerable to injury.

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#Question id: 17657

#Unit 7. System Physiology – Animal

A recent national survey revealed that college students find _____ to be the biggest impediment to their academic success.

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#Question id: 17658

#Unit 7. System Physiology – Animal

Which of the following is the most accurate description of stress?

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#Question id: 17659

#Unit 13. Methods in Biology

During your study of the gene for an enzyme you have isolated an amber mutation in the middle of the gene which produces a truncated form of the enzyme. By placing a +1 frameshift mutation a short distance before the amber mutation and a –1 frameshift mutation a short distance after the amber mutation you create a triple mutant that restores expression of a functional, full-length enzyme. 

a) +1 frameshift puts the amber mutation out of frame so that it is no longer read as a stop.

b) -1 frameshift is inserted after the amber so that no longer read as a stop.

c)  -1 frameshift is inserted after the amber to restore the frame of the end of the protein.

d) +1 frameshift puts the amber mutation out of frame so that it restore the frame of the end of the protein.

Which of the following is the correct prediction about the frame shift mutation?

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#Question id: 17666

#Unit 11. Evolution and Behavior

 In the Mesozoic era, periods included;

A. Cretaceous

B. Jurassic

C. Triassic

i) Increase of dicotyledons

ii) Seeds ferns disappear

iii) Rapid development of angiosperms

iv) Spread of cycads and conifers

v) Gymnosperms declined

Find out the correct match of given period with their plants diversification events;

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#Question id: 17667

#Unit 11. Evolution and Behavior

Jurassic periods belong to the Mesozoic era has various characteristics of invertebrates and vertebrates animals except;