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TLS Online TPP Program

#Question id: 4132

In E. coli, aminoacyl-tRNA synthetases:

#Section 3: Genetics, Cellular and Molecular Biology

  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: 14579

#Section 2: General Biology

Organisms may derive energy from
A. sunlight.
B. metabolizing chemical compounds.
C. little tiny batteries.
D. temperature gradients.
Which combination from the following is correct?
TLS Online TPP Program

#Question id: 14580

#Section 2: General Biology

Organisms that use CO2 as their source of carbon are called
TLS Online TPP Program

#Question id: 14581

#Section 2: General Biology

Chemoheterotrophs
TLS Online TPP Program

#Question id: 14582

#Section 2: General Biology

Peptone
TLS Online TPP Program

#Question id: 14583

#Section 2: General Biology

Products that limit pH changes are often incorporated into media and are referred to as
TLS Online TPP Program

#Question id: 14584

#Section 2: General Biology

A medium that inhibits the growth of organisms other than the one being sought is termed a(n)