Which of the following is a protozoan with two nuclei and no mitochondria?
A. Plasmodium
B. Paramecium
C. Euglena
D. Giardia
E. Trichomonas
Answer: D
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Among the last line of defenses against prolonged exposure to an extracellular pathogen is _____
A) lysozyme production B) phagocytosis by neutrophils C) antibody production by plasma cells D) histamine release by basophils E) lysis by natural killer cells
_____ is the main technique for the early detection of breast cancer and involves taking an X-ray of the breasts.
A. Mastectomy B. Mammoplasty C. Mastopexy D. Mammograph
A testcross involves an individual with the dominant phenotype but unknown genotype being crossed with an individual that has a(n) ________ genotype.
A. homozygous recessive B. homozygous dominant C. heterozygous dominant D. Any of the choices.
There are 40 individuals in population 1, all of which have genotype A1A1, and there are 25 individuals in population 2, all of genotype A2A2. Assume that these populations are located far from one another and that their environmental conditions are very similar. Based on the information given here, the observed genetic variation is mostly likely an example of
A) genetic drift. B) gene flow. C) disruptive selection. D) discrete variation. E) directional selection.