In an individual, an allele may be present and not express itself when
A. one allele is recessive and one allele is dominant.
B. two recessive alleles are present.
C. two dominant alleles are present.
D. the individual is haploid.
A. one allele is recessive and one allele is dominant.
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Malarial parasites are able to evade the active immune response by
a. remaining inside the host cells throughout the whole infection, thereby avoiding exposure to antibodies in the bloodstream. b. secreting substances that block the binding and recognition of their protein by host B cells. c. changing their coat proteins so that the host antibodies in current production cannot bind to them. d. overwhelming the immune cells and antibodies by an enormous production of parasitic cells. e. interfering with the production of memory cells, so that subsequent infections are just as deadly as initial ones..
Which of the following are examples of integrators?
a. brain, spinal cord b. muscles, glands c. sensory cells in eye, tongue, and ear d. bones e. none of these
Sperm are produced in the
a. testes. b. vas deferens. c. epididymis. d. prostate gland. e. penis.
To maintain homeostasis freshwater fish must _____
A) excrete large quantities of electrolytes B) consume large quantities of water C) excrete large quantities of water D) take in electrolytes through simple diffusion