Which of the following is not an accurate description of events leading to the lytic pathway following viral infection in a bacterium?
A. Upon infection, the linear bacteriophage
DNA forms a circle and transcription is
initiated from promoters PL and PR.
B. The transcripts from PR encode the
proteins cro and cII.
C. The cro protein represses transcription
from PM so that the cl protein is not
transcribed.
D. Strong protease activity rapidly degrades
cII, and cro continues to repress cI
expression, leading to the lytic path.
E. Reduced protease activity due to poor
conditions allows cII to accumulate, which
then stimulates transcription from PE and
thus expression of cI.
E
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Of the following, which kingdom contains the most diversity in terms of DNA sequences?
a. Plantae b. Protista c. Fungi d. Animalia e. All of these are approximately equivalently diverse.
The moon lacks life and varies dramatically in temperature. If we could keep a layer of water spread on the surface of the moon, what effect would it have?
A) Physical conditions would remain the same. B) Because water has a high heat of vaporization, the temperatures would rise to the upper extremes. C) The temperatures would drop to the lower extremes. D) Water would absorb and hold heat and moderate the temperature extremes. E) Life would be possible, but it would have to withstand these extremes in temperature.
Changes in climate have mostly delayed the spring behaviors of plants and animals
Indicate whether the statement is true or false
Diffusion occurs because of the ________ of molecules.
What will be an ideal response?