SRY is
A) a single-region Y gene.
B) a Y-inactivation center gene.
C) the sex-determining region of the Y chromosome.
D) a Y-controlling element.
E) None of these
C
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The process by which genetic material is exchanged between different species, such as an endosymbiont and its host, is:
A. vertical gene transfer B. horizontal gene transfer C. binary fission D. mutualism E. parasitism
What molecular precursor is converted into l-citrulline by ornithine transcarbamylase at the beginning of the urea cycle?
a. l-arginine b. arginosuccinate c. carbamoyl phosphate d. fumarate
Which hormone deficiency would lead to a female that is not ovulating?
A. follicle-stimulating hormone B. epinephrine C. cortisol D. testosterone E. calcitonin
What is the significance of upright walking?
A) It facilitates circulation. B) It facilitates digestion. C) It provides good posture. D) It frees the hands for gathering and carrying food. E) It facilitates social interactions.