Practice Questions

TLS Online TPP Program

#Question id: 4165

Which is true about proofreading activity during the synthesis of aminoacyl-tRNAs?

#Unit 3. Fundamental Processes

Proofreading is accomplished as an amino acid enters the active site of the enzyme. Incorrect amino acids are rejected before any reaction occurs.
Proofreading occurs just after aminoacyl-adenylate formation.
A separate cytosolic proofreading enzyme catalyzes the hydrolysis of incorrect aminoacyl-tRNAs.
No proofreading activity is necessary due to the high level of specificity of all aminoacyl-tRNA synthetases.

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TLS Online TPP Program

#Question id: 19289

#Unit 9. Diversity of Life Forms

Megasporangium of pine ovules

TLS Online TPP Program

#Question id: 14727

#Unit 13. Methods in Biology

Two persons A and B have respectively n + 1 and n coins, which they toss simultaneously. Then the probability that A will have more heads than B is

TLS Online TPP Program

#Question id: 19559

#Unit 12. Applied Biology

Cry proteins have 3 domains: domain III functions in

TLS Online TPP Program

#Question id: 18844

#Unit 13. Methods in Biology

In the extraction of DNA from cell with to remove the high protein content from the cell , before phenol treatment which of the following treatment is done

TLS Online TPP Program

#Question id: 1363

#Unit 4. Cell Communication and Cell Signaling

Which of the following statements best describes the difference between low-affinity integrins and high-affinity integrins?