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 basic genetic properties of the MelB– mutation?

TLS Online TPP Program

#Question id: 29487

#Unit 6. System Physiology – Plant

Some statement is given related to cytokinin

a. iP and tZ are active, and their derivatives are abundant

b. iP and tZ are inactive, and they are not abundant

c. iP and tZ are susceptible to degradation by CK oxidase (CKX). 

d. all cZ‐type CKs are derived from tRNA degradation in cZ‐abundant plant species

Which of the following is INCORRECT

TLS Online TPP Program

#Question id: 29488

#Unit 6. System Physiology – Plant

iPRTP or iPRDP is converted to ZTP or ZDP respectively by

TLS Online TPP Program

#Question id: 29489

#Unit 6. System Physiology – Plant

The ribotide and riboside forms of trans-zeatin can be interconverted, and free transzeatin can be formed from the ribotide by the

TLS Online TPP Program

#Question id: 29490

#Unit 6. System Physiology – Plant

Some statement is given related to cytokinin regarding location, expression and synthesis and concentration

a. IPT1, IPT3, IPT5, and IPT8 are located in plastids

b. KNOX gene expression increases cytokinin levels in the shoot with the help of IPT7

c. Cytokinin Primary site of synthesis -- root tips.

d. High concentrations -- immature seeds and developing fruits

Which one of the following options represents the combination of all correct statements?

TLS Online TPP Program

#Question id: 29491

#Unit 6. System Physiology – Plant

Which of the following is correctly matched with their  Response, phenomenon of photoreversibility and reciprocity 

TLS Online TPP Program

#Question id: 29492

#Unit 6. System Physiology – Plant

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