During RNA editing of the coxIII gene transcript of Trypanosoma brucei, many uridines not encoded in the gene are added to the final transcript. How is the added information obtained?
What will be an ideal response?
Ans: A guide RNA that is complementary to the sequence of the correctly edited mRNA is used. It pairs with the pre-edited mRNA, leaving gaps in the pairing representing the sequences to be inserted, and acts as a template for their insertion.
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Which statement best summarizes the major distinction between horizontal gene transfer and vertical gene transfer?
A. Genes are more stable in recipient cells following horizontal transfer that in those following vertical transfer. B. The recipient of genes in horizontal transfer is a mature cell, whereas the recipient of genes in vertical transfer is a progeny cell. C. Horizontal transfer is observed in bacteria and archaea, whereas vertical transfer is observed in all cells. D. Organisms that use horizontal transfer can only reproduce asexually, whereas organisms that use vertical transfer can reproduce sexually or asexually.
In animal bodies, __________ detect stimuli and
send signals to an __________ such as a brain. Fill in the blank(s) with the appropriate word(s).
Prominence or increase in the population of Candida sp. in the oropharynx might be expected
A. normally in adults B. after penicillin therapy C. after broad-spectrum combined drug therapy D. with antibody deficiency E. none of the above
Electrons lose energy as they pass down the electron transport chain. What is this energy used for?
A) to power hydrogen ion pumps B) to power water pumps C) to directly power ATP synthase D) to link oxygen to hydrogen ions