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TLS Online TPP Program
#Question id: 15655
#Unit 13. Methods in Biology
You are studying a new strain of E. coli that can utilize the disaccharide melibiose very efficiently. You find that utilization depends on the enzyme melibiase, which is encoded by the gene Mel1. Mel1 is not expressed unless melibiose is present in the growth medium. Next you isolate a mutation, designated MelB–, which gives uninducible melibiase activity. Mapping experiments show that MelB– is linked to Mel1. Using an F' factor that carries the chromosomal region surrounding Mel1, you perform the following genetic tests:
Describe the proposal for the type of regulatory functions affected by the MelB– mutation.
TLS Online TPP Program
#Question id: 10793
#Unit 6. System Physiology – Plant
Hydroxyl groups (−OH), and methoxy groups(−OCH3) modification provides colour variations in case of
TLS Online TPP Program
#Question id: 32718
#Unit 1. Molecules and their Interaction Relevant to Biology
When enzyme solutions are heated, there is a progressive loss of catalytic activity over time due to denaturation of the enzyme. A solution of the enzyme hexokinase incubated at 45oC lost 50% of its activity in 12 min, but when incubated at 45oC in the presence of a very large concentration of one of its substrates, it lost only 3% of its activity in 12 min. What is correct explanation
TLS Online TPP Program
#Question id: 11529
#Unit 6. System Physiology – Plant
Mustards and corn contain naturally found auxin is
TLS Online TPP Program
#Question id: 32393
#Unit 2. Cellular Organization
In sarcomere, the actin filament plus ends are anchored in the: