Phenotypically, a female (XX) mouse embryo that was transformed with a small piece of a Y chromosome bearing the SRY gene would develop as
A) a male.
B) a female.
C) an intersex individual.
D) a male initially, then revert to female after birth.
E) a female initially, then revert to male after birth.
A
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Thirty-six colonies grew in nutrient agar from 1.0 ml of undiluted sample in a standard plate count. How many cells were in the original sample?
A) 36 B) 9 C) 18 D) 4 E) 72
The molecule that carries each amino acid to its correct position along mRNA in the cytoplasm is
A. tRNA. B. mRNA. C. ATP. D. ribosomal RNA.
What is the original source of genetic variation in a population? Which natural factors affect changes in this original variation?
What will be an ideal response?
All of the following are functions of the heart EXCEPT:
A. generation of blood pressure B. ensures one way flow of blood C. generation of the formed elements of the blood D. regulates rate and force of blood delivery E. distributes oxygenated blood to tissues