In Drosophila, the sex of an individual is determined by
A. 2 pairs of alleles.
B. the number of Y chromosomes.
C. the number of X chromosomes.
D. 1 pair of alleles.
E. 1 pair of autosomes.
Answer: C
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Which of the following is not an example of goods and services provided by the environment?
A. Raw materials for goods we use every day, such as wood B. The control of erosion C. Water treatment D. All of the above are examples of goods and services provided by the environment.
A large number of copies of any DNA segment can be obtained by:
a. introducing foreign DNA into a microorganism so that it can be replicated. b. stimulating increased transcription of the appropriate sequence of mRNA. c. stimulating increased translation of the appropriate DNA molecule. d. inducing the production of DNA from proteins. e. stimulating reverse transcription of tRNA.
The chancre of syphilis
A. is very painful. B. develops into a lesion with firm margins and an ulcerated central crater. C. occurs due to small hemorrhaging of capillaries. D. occurs during the tertiary stage.
Since 1980, the proportion of adults in the
United States who are obese has ___ and the proportion of children who are obese has ___.
a. decreased by half---doubled b. doubled---decreased by half c. doubled---tripled d. tripled---doubled e. stayed the same---doubled