Which of the following does NOT contribute to variability of the offspring in sexual reproduction?
a) the different ways homologous can separate in Metaphase I
b) crossing over in Prophase I of meiosis
c) a brother and a sister producing children together
d) the swapping of genetic information between homologues during meiosis
e) combining genes from two unrelated parents during fertilization
Ans: c) a brother and a sister producing children together
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Mycobacterium tuberculosis has chemicals in its cell wall that inhibit the fusion of phagocytic vacuoles with lysosomes. Which statement is true?
A. Antibodies produced by the cells can more effectively kill the bacteria. B. The bacterium can survive and replicate inside of the phagocytic cell. C. The bacterium can produce chemicals which can destroy the macrophage housing the bacterium. D. Complement proteins will take over to destroy the bacteria.
A population ecologist is study the
demographics of American bison living on a grassland in North Dakota. She captures, marks, and releases 100 bison. Later, she recaptures 100 bison and discovers that 50 were previously marked and half of those marked are of reproductive age. What is the population ecologist’s estimate of how many bison in the total population are of reproductive age?
a. 200 b. 50 c. 100 d. 20 e. 10
Limiting factors
a. produce more pronounced effects as a population grows. b. prevent a population from producing a Jshaped curve. c. can be either density-dependent or densityindependent. d. act together in concert to form the environmental resistance to population growth. e. have all of these characteristics
Which of the following is required of an RNA virus to infect and lyse a cell?
a) transcription b) translation c) transmutation d) transcription and translation e) transcription and transmutation