#Question id: 7172
#Unit 5. Developmental Biology
Transplantation of different regions of the presomitic mesoderm (PSM) to the limb field causes changes in limb size. Following statements are:
A. Transplanting PSM from the level of the presumptive forelimb to the flank (region between the forelimb and hindlimb) results in a larger forelimb bud.
B. Transplantation of PSM from the flank region to the level of the presumptive forelimb results in a smaller forelimb bud.
C. Transplanting PSM from the level of the presumptive forelimb to the flank (region between the forelimb and hindlimb) results in a smaller forelimb bud.
D. Transplantation of PSM from the flank region to the level of the presumptive forelimb results in a larger forelimb bud.
Which of the following combination are correct?
#Question id: 10845
#Unit 10. Ecological Principles
Pseudomyrmex ants live exclusively in the swollen thorns of acacia trees. In return for food and shelter provided by the trees, the ants aggressively defend the tree from leaf-eating insects. This interaction between ants and acacias represents an example of
#Question id: 12879
#General Aptitude
#Question id: 4289
#Unit 3. Fundamental Processes
Match the Following
|
A. fidelity of codon recognition |
1. involves two adjacent adenine residues in the 16S rRNA component located within the A-site of the small subunit. These bases form hydrogen bonds with the minor groove of each correct base pair formed between the anticodon and the first two bases of the codon in the A-site |
|
B. kinetic selectivity |
2. Even a single mismatch in the codon–anticodon base pairing alters the position of EF-Tu, reducing its ability to interact with the factor-binding center. This, in turn, leads to a dramatic reduction in EF-Tu GTPase activity |
|
C. Accommodation |
3. When the charged tRNA is first introduced into the A-site in a complex with EF-Tu-GTP, its 30 end is distant from the site of peptide-bond formation. To participate successfully in the peptidyl transferase reaction, the tRNA must rotate into the peptidyl transferase center of the large subunit in a process |
#Question id: 14506
#Unit 13. Methods in Biology