Which of the following stimulates spermatogenesis?
a. Gonadotropin-releasing hormone
b. Testosterone
c. Progesterone
d. Luteinizing hormone
b. Testosterone
Testosterone stimulates spermatogenesis; it is also responsible for developing secondary sex characteristics in males during adolescence.
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True or false: Many mutations are detrimental to organisms that acquire them, but other mutations are beneficial and drive evolution of that species
A. true B. false
In a cloning experiment, you use a vector that contains a lacZ gene as a selectable marker. If the competent cells are grown on X-Gal and IPTG, which colonies would contain chromosomal DNA?
A. The white colonies B. The blue colonies C. Half the total colonies D. None of the colonies
DNA studies can be used to make all of the following conclusions except that
A. The gibbon ape line diverged about 15 million years ago. B. Orangutans split off about 10 million years ago. C. The gorilla lineage diverged about 8 million years ago. D. Modern man remained changeless for the last 1 million years.
What would happen if sister chromatids did not break apart during anaphase of mitosis? What will be an ideal response?