Describe how the 3? ends of mature mRNAs are generated
What will be an ideal response?
Ans: After termination of transcription, the 3? ends of mRNAs are modified by a protein complex that includes a specificity factor, an endonuclease, and the enzyme poly(A) polymerase. The specificity factor and the endonuclease recognize the sequence AAUAAA in the transcript and cleave it just downstream from that sequence. The specificity factor and poly(A) polymerase then approximately 200 adenine nucleotides (the poly(A) tail) to the 3? end of the transcript.
You might also like to view...
Transgenic plants produced by biotechnology contain fewer introduced genes than altered plants obtained by traditional breeding methods
a. True b. False Indicate whether the statement is true or false
The population is in exponential growth at
a. A. b. B. c. C. d. D. e. E.
All living things are able to maintain stable internal conditions, whether they are unicellular or complex, multicellular organisms. This property is called:
A. homeostasis B. cellular organization C. metabolism D. heredity
Which statement is not true about T cell subclass differentiation?
A) T cell subclass differentiation is caused by the release of cytokines that is influenced by the antigen's nature and the amount present. B) Regardless of which T helper cell subclass develops during an immune response, the humoral response is not impacted. C) Particular combinations of cytokines will favor the development of some T cell subclasses over others. D) Each subclass will include both effector and memory cells. E) Which specific T helper cell subclass that develops may impact the progression and outcome of an infectious disease.