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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

  1. (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.

  2. (i) – The B form, which is observed at high humidity, most closely corresponds to the average structure of DNA under physiological conditions.

  3. (iii) – Z DNA is a left-handed helix and has a zigzag (hence “Z”) appearance and has an anti-conformation of glycosyl bond.

  4. (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: 2429

#Unit 2. Cellular Organization

Which of the following statements is (are) true of actin assembly?

a. ADP-actin can assemble into filaments.    

b. Actin (+) ends grow faster than actin (-) ends.

c. ATP-actin can assemble into filaments.

d. Toxins that alter the assembly of actin filaments have been used as tools to study actin in living cells.
TLS Online TPP Program

#Question id: 28429

#Unit 5. Developmental Biology

At which stage the primitive streak cells form a third layer that lies between the hypoblast and epiblast cells?
TLS Online TPP Program

#Question id: 30104

#Unit 1. Molecules and their Interaction Relevant to Biology

A nucleoside phosphorylase:

1. cleaves a nucleoside with the production of ribose 1-phosphate.
2. is necessary for the major salvage pathway for pyrimidines.
3. is used in the degradation of purine nucleotides.
4. is responsible for the equilibration of nucleoside monophosphates and nucleoside diphosphate.
TLS Online TPP Program

#Question id: 31355

#Unit 13. Methods in Biology

Which of the following is agglutination reaction based immuno-technique
TLS Online TPP Program

#Question id: 24506

#Unit 10. Ecological Principles

the immunological response is short-lived, the infections tend to be persistent by