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.

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

Nearly all organic substances enter plant cells by ________.

A. Osmosis B. Diffusion C. Symport D. Stomata E. Antiport

Biology & Microbiology

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

Biology & Microbiology