#Question id: 711
#Unit 1. Molecules and their Interaction Relevant to Biology
The shortest alpha helix segment in a protein that will span a membrane bilayer has about.
#Question id: 4107
#Unit 3. Fundamental Processes
Imagine that you have created a fusion between the Trp operon, which encodes the enzymes for tryptophan biosynthesis, and the Lac operon, which encodes the enzymes necessary for lactose utilization. Under which set of conditions (A–F below) will β-galactosidase be expressed in the strain that carries the fused operon?
A. Only when lactose and glucose are both absent.
B. Only when lactose and glucose are both present.
C. Only when lactose is absent and glucose is present.
D. Only when lactose is present and glucose is absent.
E. Only when tryptophan is absent.
F. Only when tryptophan is present.
#Question id: 23233
#Unit 2. Cellular Organization
#Question id: 4432
#Unit 3. Fundamental Processes
A transcription factor binds to the sequence TAAGCTAAGCCCTTG and inhibits transcription. What functional domains must this protein contain? (Note: no other transcription factor can bind this sequence)
#Question id: 11815
#Unit 6. System Physiology – Plant
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?