Practice Questions

TLS Online TPP Program

#Question id: 4135

In the “activation” of an amino acid for protein synthesis:

#XL - T Zoology

leucine can be attached to tRNAPhe, by the aminoacyl-tRNA synthetase specific for leucine.
methionine is first formylated, then attached to a specific tRNA.
the amino acid is attached to the 5' end of the tRNA through a phosphodiester bond.
there is at least one specific activating enzyme and one specific tRNA for each amino acid.

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TLS Online TPP Program

#Question id: 4947

#XL - S Microbiology

The first genes on Earth were probably

TLS Online TPP Program

#Question id: 4947

#XL - T Zoology

The first genes on Earth were probably

TLS Online TPP Program

#Question id: 4948

#XL - S Microbiology

RNA molecules can both carry genetic information and be catalytic. This supports the proposal that

TLS Online TPP Program

#Question id: 4948

#XL - T Zoology

RNA molecules can both carry genetic information and be catalytic. This supports the proposal that

TLS Online TPP Program

#Question id: 4949

#XL - S Microbiology

What probably accounts for the switch to DNA-based genetic systems during the evolution of life on Earth?

TLS Online TPP Program

#Question id: 4949

#XL - T Zoology

What probably accounts for the switch to DNA-based genetic systems during the evolution of life on Earth?