#Question id: 1632
#Unit 4. Cell Communication and Cell Signaling
A single plasma cell secretes:
#Question id: 26413
#Unit 3. Fundamental Processes
#Question id: 4296
#Unit 3. Fundamental Processes
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
#Question id: 11809
#Unit 6. System Physiology – Plant
Shortly after the discovery of kinetin, it was observed that
the differentiation of cultured callus tissue derived from tobacco pith
segments into either roots or shoots depends on the ratio of auxin to cytokinin
in the culture medium. Whereas
a) high auxin:cytokinin ratios stimulated the formation of
roots
b) high auxin:cytokinin ratios stimulated the formation of
shoots
c) low auxin:cytokinin ratios led to the formation of shoots
d) low auxin:cytokinin ratios stimulated the formation of
roots
which of the following combination is correct about the ratio of auxin to cytokinin
#Question id: 28222
#Unit 5. Developmental Biology
Hematopoietic stem cells has the ability to divide into lymphoid progenitor cell as well as myeloid progentior cell only, this is an example of