In the development of a plant's ovule, the result is a gametophyte made up of
A) seven cells: six haploid cells and one cell with two nuclei.
B) seven diploid cells and one haploid cell.
C) eight haploid, uninucleate cells.
D) seven binucleate cells and one haploid cell.
A
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Which function is not mediated through the integumentary system?
A. Protection against infection B. Peripheral circulation C. Fluid control D. Temperature control
A large number of cases of a particular disease observed in a relatively short period of time in an area that previously experienced only sporadic cases of the disease is known as a(n)
A) pandemic. B) outbreak. C) endemic. D) zoonosis.
At sea level, what is the partial pressure (mm Hg) of oxygen in the air we breathe?
a. 21 b. 50 c. 100 d. 160 e. 540
For each of the following E. coli partial diploid strains, indicate whether expression of -galactosidase and permease is inducible (I), constitutive (C), or negative (no product made) (N). Assume glucose levels are very low
Which of the strains are able to use lactose as their sole carbon source?