In both prokaryotic and eukaryotic ribosomes, how many tRNAs are active in translation at a particular moment?
What will be an ideal response?
Ans: Both ribosomes have binding sites for two tRNAs, one attached to the nascent polypeptide at the P site and one attached to the incoming amino acid at the A site. In bacterial ribosomes, there is a third binding site (E site) for the discharged tRNA before it is released from the ribosome.
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If a mutation prevented synthesis of the beta subunit of DNA pol III, which would be most affected?
A. DNA unwinding B. formation of RNA primers C. formation of the replication fork D. processivity E. removal of RNA primers Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain? Gather Content · What do you already know about DNA polymerase? Consider Possibilities · Consider the different answer options. Which can you rule out? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The restriction enzyme SmaI cuts DNA at the 6-base recognition sequence 5'-CCCGGG-3'. Calculate the frequency of occurrence of this sequence. (Assume a 50% GC content.)
What will be an ideal response?
An individual is constipated. They take magnesium salts to help loosen the stool. Why does this work?
A. Water moves from the intestines to the blood because the blood is hypertonic B. Water moves from the blood to the intestines because the blood is hypotonic. C. Water moves from the blood to the intestines because the blood is hypertonic D. Water moves from the intestines to the blood because the blood is hypotonic.
How does the cell wall of bacteria and archaea differ?
A) Bacteria use pseudopeptidoglycan. B) Bacteria use peptidoglycan. C) Bacteria have a lot of diversity in the makeup of their cell walls. D) Archaea use peptidoglycan. E) Archaea have little diversity in the makeup of their cell walls.