Colorblindness is more common in males than in females because the allele for colorblindness is
A) recessive and located on the X chromosome.
B) recessive and located on the Y chromosome.
C) recessive and located on the Y chromosome.
D) dominant and located on the X chromosome.
Ans: A) recessive and located on the X chromosome.
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Defenses of the GI tract against pathogens include ________.
A. mucus, acid, and saliva B. secretory IgA and lysozyme C. GALT (gut-associated lymphoid tissue) D. peristalsis E. All of the choices are correct.
Asexual reproduction in flowering plants does not usually involve the formation of:
a. plantlets, stolons, or seeds. b. suckers, corms, or rhizomes. c. flowers, seeds, or fruits. d. bulbs, rhizomes, or seeds. e. flowers, bulbs, or stolons
Aspirin and other nonsteroidal anti-inflammatory drugs (NSAID) inhibit inflammation by inhibiting an enzyme in the prostaglandin pathway. However, inhibiting this enzyme also inhibits other pathways that protect the stomach from damage by stomach acid
and that form blood clots. What can you conclude from this? A) The enzyme inhibition is nonreversible. B) The enzyme is found in many different types of cells. C) Prostaglandins cause blood clotting. D) Aspirin should not be given to people who people who need to synthesize enzymes.
What types of cells does HIV infect?
A. basophils and killer T cells B. B cells and red marrow cells C. helper T cells and macrophages D. liver cells and cardiac muscle cells E. epithelial cells and eosinophils