The vertebrae of today’s cod fish is a _____ with the prehistoric bony fish who also possessed vertebrae
a. homoplastic character
b. monophyletic character
c. shared derived character
d. shared ancestral character
e. shared homologous character
d
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Bacteria use the protein ________, which is structurally related to tubulin, to form a ring at the site where the two daughter cells will separate
Fill in the blank with correct word.
Brown algae lack true roots, but have similar structures called ____ that anchor them to the substrate
a. stipes b. fronds c. thalli d. blades e. holdfasts
Recently Zika virus has been in the news, with many cases in Central and South America and increasing numbers of cases in the southern United States. Five years ago this virus was essentially unheard of in these areas. This is an example of
A. a pandemic. B. an endemic virus. C. an emerging infectious disease. D. genetic recombination.
Which statement concerning gamete production is correct?
A) Progestins stimulate development of new follicles. B) Sperm cells can be produced only at certain points in the reproductive cycle. C) The number of sperm a man can produce is essentially unlimited, whereas the number of eggs a woman can potentially produce is limited. D) A man is born with all of the sperm he will need for the rest of his life.