Practice Questions

TLS Online TPP Program

#Question id: 11588

Correct and appropriate signal transduction processes are generally under strong selective pressure and are determined by the properties of the molecules involved, the concentrations of signal and receptor molecules, and the binding affinities between signal and receptor. Therefore, a hormone action is very specific in a species at any one point in time. However, there are examples of very diverse functions of a specific hormone between groups of organisms. For example, thyroxin, which is produced in all vertebrates and many invertebrates, can trigger growth, differentiation, metamorphosis, maturation, reproduction, behavior, temperature tolerance, osmoregulation, or seasonal adaptation depending on the organism in which it is produced. What is the most logical explanation for such different responses triggered by thyroxin in organisms?

#Unit 7. System Physiology – Animal

The concentration of thyroxin varies in different organisms. Invertebrate organisms do not have as much thyroxin as vertebrate organisms.
Thyroxin and its receptor molecules have a different binding affinity in different organisms.
Receptor molecules for thyroxin are located on different tissues in different organisms.
The function of thyroxine in a particular tissue is determined by the genes that are transcribed by the activated thyroxine receptor.

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TLS Online TPP Program

#Question id: 652

#Unit 1. Molecules and their Interaction Relevant to Biology

Two proteins, X and Y, bind to the same ligand, A, with the binding curves shown below. Which of the statement is correct for the graph analysing two proteins?

TLS Online TPP Program

#Question id: 653

#Unit 1. Molecules and their Interaction Relevant to Biology

For the enzyme-catalyzed reaction S ~ P, Keq = 5, which of the following curves best represents the change in [S] that occurs with time when S is added to a solution containing the appropriate enzyme?

TLS Online TPP Program

#Question id: 653

#Unit 1. Molecules and their Interaction Relevant to Biology

TLS Online TPP Program

#Question id: 22010

#Unit 1. Molecules and their Interaction Relevant to Biology

Some of the following characteristics of graph are given below related to Lineweaver-Burk equation

a) Also known as double reciprocal

b) Both the variable of X and Y axis are independent to each other

c) Both the variable of X and Y axis are dependent to each other

d) positive plot observed

e) Km obtained from slope