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TLS Online TPP Program

#Question id: 4132

In E. coli, aminoacyl-tRNA synthetases:

#XL - T Zoology

  1. activate amino acids in 12 steps

  2. are amino acid–specific; there is at least one enzyme specific for each amino acid.

  3. fall into two classes, each of which attaches amino acids to different ends of the tRNA.

  4. have no proofreading activities.

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TLS Online TPP Program

#Question id: 2113

#XL - T Zoology

Why are lipids and proteins free to move laterally in membranes?
TLS Online TPP Program

#Question id: 1676

#XL - Q Biochemistry

NK cells lack receptors with:
TLS Online TPP Program

#Question id: 9619

#XL - R Botany

A common ancestor for both species C and E could be at position number 
TLS Online TPP Program

#Question id: 14999

#XL - T Zoology

I know that black coat color in mice is dominant to albino. Black mice get a higher price at the pet store so I am disappointed when I cross a black mouse with an albino mouse and get 6 albino and 2 black mice in the litter. I expected all black. What mistake did I make?
TLS Online TPP Program

#Question id: 403

#XL - S Microbiology

For the reaction A -> B, DG'° = –60 kJ/mol.  The reaction is started with 10 mmol of A; no B is initially present.  After 24 hours, analysis reveals the presence of 2 mmol of B, 8 mmol of A. Which is the most likely explanation?