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#Question id: 4165


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

#SCPH01 Biochemistry
  1. Proofreading is accomplished as an amino acid enters the active site of the enzyme. Incorrect amino acids are rejected before any reaction occurs.

  2. Proofreading occurs just after aminoacyl-adenylate formation.

  3. A separate cytosolic proofreading enzyme catalyzes the hydrolysis of incorrect aminoacyl-tRNAs.

  4. No proofreading activity is necessary due to the high level of specificity of all aminoacyl-tRNA synthetases.

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#Question id: 8950

#SCPH28 | Zoology

You have before you a living organism, which you examine carefully. Which of the following should convince you that the organism is acoelomate?

TLS Online TPP Program

#Question id: 5043

#I Life Science/ Life Sciences Group – I-V

 The ability of a single cell to divide and produce all of the differentiated cells in an organism:

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#Question id: 3515

#SCPH01 Biochemistry

What proportional of F2 round seeded plant would produce all round plant after self fertilization?

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#Question id: 7766

#SCPH06 I Botany

The relationship between shortened telomeres and stem cell depletion has been seen in degenerative diseases such as mouse muscular dystrophy,

I) When____ is activated by damaged telomeres, DNA replication halts, and if the repair doesn’t work, apoptosis is initiated. If the cell is a stem cell or some other rapidly replicating cell, this will reduce the numbers of cells produced, and the lack of stem cells will produce an “aged” phenotype.

 II) When ____ is activated by damaged telomeres, DNA replication halts, repair do its work, apoptosis is inhibited. If the cell is a stem cell or some other rapidly replicating cell, this will increase the numbers of cells produced, and then these cells will produce an “aged” phenotype.

 Choose correct gene name with right statement

TLS Online TPP Program

#Question id: 4187

#SCPH28 | Zoology

Prokaryotic mRNA molecules that contain several coding regions that encode several polypeptides are __.