The vir genes of the Ti plasmid
a. are transferred to the plant cell.
b. are an example of a classic bacterial system in which stimulation of a sensor protein causes automethylation and transfer of the methyl to the second protein.
c. are activated by phenolic compounds released by plant wounds.
d. are expressed constitutively.
e. are not required for transfer of DNA.
Ans: c
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Efficiently translated mRNAs tend to be stable in the cytoplasm; those that are poorly translated tend tobe rapidly degraded. Which of the following is not a step in the pathway for mRNA degradation?
A. targeting of upstream ORFs for nuclease binding B. removal of the poly(A) tail C. removal of the 5' 7-meG cap D. binding of mRNA by 5'-3' and 3'-5' RNA exonucleases
The 1st level at which energy will enter an ecosystem is via the: a. primary consumers
b. secondary consumers. c. tertiary consumers. d. secondary producers. e. primary producers.
The main nitrogenous waste of freshwater fishes is:
a. ammonia. b. urea. c. uric acid. d. amino acids. e. purines.
Why are negative feedback loops more effective at maintaining homeostasis than positive feedback loops?
What will be an ideal response?