Approximately what percent of the energy that
enters a trophic level becomes available to the
next trophic level?
a. 2 to 12
b. 3 to 13
c. 4 to 14
d. 5 to 15
e. 5 to 30
E
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At what phase of the cell cycle does p53 halt cell division if it senses DNA damage?
A. S B. G2 C. M D. G0 E. G1
Recommendations regarding hand-washing, handling of pipettes and sharps, prohibition of personal activities such as eating, applying makeup and handing contact lenses, directions regarding decontamination of work surfaces, cultures, and other potentially infectious material are all included in a set of guidelines known as ________.
What will be an ideal response?
The Hawthorne and apple maggot flies appear to have become reproductively isolated from each other
largely because:a. they occur on different sides of the Mississippi River. b. they have different mating behaviors. c. they occupy different parts of the habitat. d. they have adapted to two different hosts. e. they mate at different times of the day.
The single-nucleotide polymorphisms found in the human population __________________
(a) are important for genetic mapping because they represent mutations in genes important for human disease. (b) are rarely found among blood relatives. (c) can be linked into haplotype blocks. (d) arose mainly during the past 10,000 years.