Which of the following is not true of the second step of translational elongation in bacteria?
A. The carboxyl group oxygen of the A-site amino acid is the nucleophile in peptide bond formation.
B. A peptide bond is formed between the two amino acids bound by the tRNAs in the A and Psites.
C. The growing polypeptide chain is transferred to the tRNA in the A site.
D. The ?-amino group of the A-site amino acid attacks the carbonyl carbon of the P-site amino acid.
A
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Upon transmission of a nerve signal to a muscle cell, ________ is released from the sarcoplasmic reticulum through a gated channel.
Fill in the blank(s) with the appropriate word(s).
Answer the following statements true (T) or false (F)
1. Two species of three-spined stickleback fish live in a single lake in British Columbia. They are closely related but occupy different niches. They exist nowhere else. These species most likely arose by sympatric speciation from a single species of three-spined stickleback. 2. The pace of evolution remains constant despite sudden environmental shifts such as climate change. 3. Although most genetic sequence information is obtained from living species, it is sometimes possible to obtain DNA from small tissue samples of extinct species for use in constructing phylogenetic trees. 4. Alan Cooper, Cécile Mourer Chauviré, Geoffrey Chambers, Arndt von Haeseler, Allan Wilson and Svante Pääbo investigated the evolutionary relationships among some extinct and living species of flightless birds using tissue samples from museums and from living birds. This is an example of discovery-based science.
Nonheritable gene therapy is performed on ________ cells.
A) germline B) somatic C) bacterial D) gametic
Mycorrhizal fungi
What will be an ideal response?