Practice Questions

TLS Online TPP Program

#Question id: 801

Identify the type of DNA from the structures given below and match the correct form with its characteristics described.

#Unit 1. Molecules and their Interaction Relevant to Biology

(ii) – The more compact A form of DNA has 11 bp per turn and shows a large tilt of the base pairs with respect to the helix axis.
(i) – The B form, which is observed at high humidity, most closely corresponds to the average structure of DNA under physiological conditions.
(iii) – Z DNA is a left-handed helix and has a zigzag (hence “Z”) appearance and has an anti-conformation of glycosyl bond.
(i) – The A form which is observed under low humidity has a structure similar to the structure that RNA adopts when double-helical.

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TLS Online TPP Program

#Question id: 28604

#Unit 2. Cellular Organization

What will cause the phosphorylation of T14 and Y15 in this G-loop?

a) It introduces negative charge that electrostatically interferes with the binding of ATP in the catalytic pocket

b) It introduces ionic bond interferes with the binding of ATP in the catalytic pocket

c) play a critical role in controlling CDK activity

d) Allows the binding of CDK with cyclins

Which of the following is correct about phosphorylation;

TLS Online TPP Program

#Question id: 2395

#Unit 2. Cellular Organization

Which structure is not part of the endomembrane system?

TLS Online TPP Program

#Question id: 4105

#Unit 3. Fundamental Processes

The GAL4 protein activates transcription from the GAL1 promoter in yeast. To bind to DNA, the protein utilizes a

TLS Online TPP Program

#Question id: 18864

#Unit 13. Methods in Biology

In light microscopy, the highest resolution is attained with-

TLS Online TPP Program

#Question id: 4945

#Unit 11. Evolution and Behavior

Which is a defining characteristic that all protobionts had in common?