If there was random mating and no evolution in the kangaroo rat population shown here, in the next generation if there were 1000 individuals, about how many dark brown kangaroo rats would you expect to see?
a) 24
b) 10
c) 218
d) 78
e) 2
Ans: a) 24
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The tubercles formed in primary tuberculosis are caused by an influx of ________.
A. mononuclear cells B. neutrophils C. basophils D. antibodies E. polymorphonuclear leukocytes
In comparing mitosis and meiosis, which of the
following statements is TRUE?
a. Crossing over occurs in a prophase of meiosis and of mitosis. b. The product of both is two cells. c. In both processes, homologous chromosomes pair up. d. In meiosis, sister chromatids separate in a metaphase, whereas in mitosis they separate in an anaphase. e. Anaphase of mitosis is most like Anaphase II of meiosis.
Which of the following correctly explains what a heart attack is?
A. Veins that supply the heart with oxygen become blocked. B. Arteries that supply the heart with oxygen become blocked. C. Veins that supply the brain with oxygen become blocked. D. Arteries that supply the brain with oxygen become blocked.
Which step of the photosynthesis pathway produces a carbohydrate from CO2 in the atmosphere?
A. the light reactions B. ATP production C. the Calvin cycle D. the C4 pathway