#Question id: 1732
#Unit 4. Cell Communication and Cell Signaling
Protein tyrosine kinase activity following T-cell stimulation:
#Question id: 18224
#Unit 11. Evolution and Behavior
#Question id: 2863
#Unit 2. Cellular Organization
The promoter of the araBAD operon from E. coli is activated in the presence of arabinose and the absence of glucose and directs expression of genes encoding enzymes required for arabinose metabolism. Unlike the cases of lac and gal genes, where a repressor and an activator work together, here two activators work together: AraC and CAP
|
+ arabinose |
AraC binds that sugar and adopts a configuration that allows it to bind DNA as a dimer to the adjacent half-sites, araI1 and araI2 |
|
– arabinose |
the AraC dimer adopts a different conformation and binds to araO2 and araI1, there is no monomer at site araI2, and so the protein cannot activate the araBAD promoter (araPBAD). This promoter is also controlled by CAP. |
#Question id: 5149
#General Aptitude
If the number 517 * 324 is completely divisible by 3, then the smallest whole number in place of * will be :
#Question id: 4770
#Unit 8. Inheritance Biology
When two independent pure lines of pea with white flowers are crossed, the F1 progeny has purple flowers. The F2 progeny obtained on selfing shows both pruple and white flower in a ratio of 15:1. The following conclusions were made
A. Two different genes are involved, mutation in which lead to formation of white flower.
B. These two genes does not show independent assortment
C. This is an example of complementary gene action
D. The is an example of duplicate genes
Which of the following conclusions are correct?