When Rb is phosphorylated, E2F activates the transcription of which of the following?
A. Cyclin A
B. Cyclin B
C. Cyclin C
D. Cyclin D
E. Cyclin E
Ans: E. Cyclin E
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What are the problems with cloning as a conservation strategy? Check all that apply.
_____ It often requires finding appropriate surrogate mothers. _____ Populations of cloned individuals grow too quickly. _____ It requires detailed knowledge of species' reproductive biology. _____ It increases genetic diversity of a species beyond natural levels. _____ The root causes of species loss are not addressed by cloning methods.
How do spheroplasts and protosplasts differ?
A. Spheroplasts retain the peptidoglycan but protoplasts do not. B. Spheroplasts retain their outer membrane but protoplasts do not. C. Spheroplasts form from cocci and protoplasts form from bacilli. D. There is no difference; these terms are synonyms.
Which technique is used to mass produce copies of a section of DNA outside of a cell?
a. Transcription b. Translation c. Electrophoresis d. DNA sequencing e. Polymerase chain reaction
A person chokes when food becomes lodged inthe ____
a. esophagus b. trachea c. larynx d. sinus e. pharynx