Which of the following statements about species, as defined by the biological species concept, is (are) correct? I. Biological species are defined by reproductive isolation. II. Biological species are the model used for grouping extinct forms of life. III. All members of a species can potentially interbreed.
A) I and II
B) I and III
C) II and III
D) I, II, and III
Answer: B
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Cows are able to survive on a diet consisting almost entirely of cellulose because
A. cows are autotrophic. B. the cow, like the rabbit, ingests its feces. C. cows can manufacture all 20 amino acids out of sugars in the liver. D. unlike humans, the saliva the cow produces has enzymes capable of digesting cellulose. E. cows have cellulose-digesting, symbiotic microorganisms in their rumens.
The chi-square value is the sum for all progeny classes of (observed-expected)2/expected. Using the chi-square test for goodness of fit, calculate the chi-square value to test the null hypothesis that genes C and D are unlinked. What is the chi-square value?
A dihybrid testcross is made to determine if genes C and D are linked. The results are shown in the table.
A) 0
B) 0.0576
C) 10.8
D) 14.4
E) cannot be determined
The resting potential of a particular nerve cell is ?66 mV. Depolarization of the neuron membrane will shift the membrane potential to
A) ?90 mV. B) ?75 mV. C) 0 mV. D) +45 mV. E) +66 mV.
The drug Gleevec is useful in the treatment of:
A) acromegaly B) chronic myelogenous leukemia C) heart disease D) influenza E) diabetes