Practice Questions

TLS Online TPP Program

#Question id: 28782

The rate of polymerization of actin filaments is given by rate constant K, in which_____
a) the addition of monomers is given by kon (M^–1 sec^–1 )
b) the addition of monomers is given by koff (sec^–1)
c) the loss of monomers is given koff (M^–1 sec^–1 )
d) the loss of monomers is given koff (sec^–1)

#Unit 2. Cellular Organization

Only a
a and c
a and b
a and d

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TLS Online TPP Program

#Question id: 3982

#Unit 3. Fundamental Processes

The diagram below represents a hypothetical operon in the bacterium E. coli. The operon consists of two structural genes (A and B) that code for the enzymes A-ase and B-ase, respectively, and also includes P (promoter) and O (operator) regions as shown.

When a certain compound (X) is added to the growth medium of E. coli, the separate enzymes A-ase and B-ase are both synthesized at a 50-fold higher rate than in the absence of X (which has a molecular weight of about 200). Which one of the following statements is true of such an operon?

TLS Online TPP Program

#Question id: 27138

#Unit 7. System Physiology – Animal

The enzyme primarily responsible for the conversion of T4 to T3 in the periphery is

TLS Online TPP Program

#Question id: 12720

#Unit 6. System Physiology – Plant

Several genes coding for enzymes associated with osmotic adjustment are turned on (up-regulated) by osmotic stress and/or salinity, and cold stress. These genes encode enzymes such as the following;

I) ∆′1-Pyrroline-5-carboxylate synthase, a key enzyme in the proline biosynthetic pathway

II) myo-Inositol 6-O-methyltransferase, a rate-limiting enzyme in the accumulation of the cyclic sugar alcohol called pinitol

III) Betaine aldehyde dehydrogenase, an enzyme involved in glycine betaine accumulation

Given following statements of gene encoding enzyme is correct?