#Question id: 22970
#Unit 7. System Physiology – Animal
#Question id: 12595
#Unit 10. Ecological Principles
Use the following diagram of five islands formed at around the same time near a particular mainland and MacArthur and Wilson's island biogeography principles to answer the following questions
Which island would likely have the lowest immigration rate?
#Question id: 19561
#Unit 12. Applied Biology
#Question id: 9206
#Unit 9. Diversity of Life Forms
To better comprehend the magnitude of current extinctions, it will be necessary to ________.
#Question id: 4267
#Unit 3. Fundamental Processes
The 3D structure of the complete Escherichia coli ribosome with bound mRNA and tRNAs revealed that the very amino terminus of one protein (L27) does reach into the active site. This finding suggested a role for this protein in catalysis. To test this possibility, the nine amino acids at the L27 amino terminus that were in close proximity to the active site were eliminated by mutation. The following possible outcomes were found to be correct as
A. The resulting cells produced ribosomes with reduced but detectable peptidyl transferase activity
B. Region of the L27 protein contributes to peptidyl transferase activity
C. The mutant ribosomes, didn’t synthesised wildtype levels of cells
D. Vast majority of this increase in peptide bond formation is retained, even without the presence of L27 in the active site
E. The most likely role for L27 is to correctly position one or more of the RNA components of the active site