TLS Online TPP Program

#Question id: 1971


If a newborn were accidentally given a drug that destroyed the thymus, what would most likely happen?

#Unit 4. Cell Communication and Cell Signaling
  1. His cells would lack class I MHC molecules on their surface.

  2. His humoral immunity would be missing.

  3. Genetic rearrangement of antigen receptors would not occur.

  4. His T cells would not mature and differentiate appropriately.

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TLS Online TPP Program

#Question id: 4234

#Unit 3. Fundamental Processes

Accuracy in the translation of mRNA into the primary structure of a polypeptide depends on specificity in the __.

TLS Online TPP Program

#Question id: 4235

#Unit 3. Fundamental Processes

What would be the consequence of a mutation in a bacterial cell that produces a defective aminoacyl-tRNA synthetase that attaches a lysine instead of the normal phenylalanine to tRNAs with the anticodon AAA?

TLS Online TPP Program

#Question id: 4236

#Unit 3. Fundamental Processes

In bacteria, there are 61 mRNA codons that specify an amino acid, but only 45 tRNAs. Which of the following statements explains this fact?

TLS Online TPP Program

#Question id: 4237

#Unit 3. Fundamental Processes

A part of an mRNA molecule with the following sequence is being read by a ribosome: 5′-CCGACG- 3′ (mRNA). The following charged transfer RNA molecules (with their anticodons shown in the 3′ to 5′ direction) are available. Two of them can correctly match the mRNA so that a dipeptide can form. Which of the following dipeptides will form from this mRNA?

tRNA AnticodonAmino Acid
GGCProline
CGUAlanine
UGCThreonine
CCGGlycine
ACGCysteine
CGGAlanine

TLS Online TPP Program

#Question id: 4238

#Unit 3. Fundamental Processes

Use the following information to answer the question. A part of an mRNA molecule with the following sequence is being read by a ribosome: 5′-CCGACG- 3′ (mRNA). The following charged transfer RNA molecules (with their anticodons shown in the 3′ to 5′ direction) are available. Two of them can correctly match the mRNA so that a dipeptide can form.

tRNA AnticodonAmino Acid
GGCProline
CGUAlanine
UGCThreonine
CCGGlycine
ACGCysteine
CGGAlanine

TLS Online TPP Program

#Question id: 4239

#Unit 3. Fundamental Processes

Use the figure to answer the question. What type of bonding is responsible for maintaining the shape of the tRNA molecule shown in the figure?