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TLS Online TPP Program

#Question id: 4296

 Normally, a stop codon is required to release the ribosome from an mRNA but what happens to a ribosome that initiates translation of an mRNA fragment that lacks a termination codon. The Ribosome stalled at broken part of mRNA. In prokaryotic cells, such stalled ribosomes are rescued by the action of a chimeric RNA molecule that is part tRNA and part mRNA, appropriately called a tmRNA. What is sequence of events of this rescue process.

A. Translocation of the peptidyl-SsrA RNA results in the release of the broken mRNA

B. the SsrAAla–EF-Tu–GTP complex binds to the A-site of the ribosome and participates in the peptidyl transferase reaction

C. portion of the SsrA RNA acts as an mRNA and encodes 10 codons followed by a stop codon

D. the protein encoded by the incomplete mRNA is fused to a 10-amino-acid “peptide tag” at its carboxyl terminus, and the ribosome is recycled. Interestingly, the 10-amino-acid tag is recognized by cellular proteases that rapidly degrade the tag and the truncated polypeptide to which it is attached

#Unit 3. Fundamental Processes

  1. BACD  

  2. CABD   

  3. BACD  

  4. ABCD

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TLS Online TPP Program

#Question id: 2005

#Unit 4. Cell Communication and Cell Signaling

A transfusion of type A blood given to a person who has type O blood would result in which of the following?
TLS Online TPP Program

#Question id: 26492

#Unit 3. Fundamental Processes

he final RNA processing event, polyadenylation of the 3’end of the mRNA, is intimately linked with the termination of transcription. Just as with capping and splicing, the polymerase CTD tail is involved in recruiting some of the enzymes necessary for polyadenylation,
TLS Online TPP Program

#Question id: 218

#Unit 1. Molecules and their Interaction Relevant to Biology

We use the term tetrahydrofolate to designate a family of related compounds. What is the main difference between members of this family?
TLS Online TPP Program

#Question id: 321

#Unit 1. Molecules and their Interaction Relevant to Biology

Water clustered about nonpolar molecules contribute to hydrophobic interactions because
TLS Online TPP Program

#Question id: 5682

#Unit 5. Developmental Biology

During prevention of polyspermy in sea urchin the shift from ___1___ to __2____is the result of a small influx of Na+ into the egg through newly opened sodium channels. Sperm cannot fuse with egg cell membranes that have a ___3___ resting potential, so the shift means that no more sperm can fuse to the egg.