When a concept has been tested repeatedly and appears to be a uniform or constant fact of nature, it is called
A. empirical evidence.
B. a hypothesis.
C. a deduction.
D. a law.
D. a law.
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Which of the following is evidence supporting the Lyon hypothesis of X inactivation?
A. Female mammals that are heterozygous for X-linked traits are phenotypic mosaics. B. A highly condensed structure is consistently observed in female cells, but not in normal male cells. C. A female cat that is homozygous for coat color cannot have a calico phenotype. D. Calico patterns of coat color are never exactly the same. E. All of these are correct
If there are 32 sister chromatids in a normal somatic cell, what is the haploid number for that cell?
A. 32 B. 8 C. 64 D. 16
Nearly all organic substances enter plant cells by ________.
A. Osmosis B. Diffusion C. Symport D. Stomata E. Antiport
Which of the following diseases is transmitted by the bite of human body lice?
A) bubonic plague B) tularemia C) Pontiac fever D) trench fever E) brucellosis