What is a Calorie
What will be an ideal response?
The amount of energy needed to raise 1 liter of water 1 degree Celsius
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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
Which of the following best describes the development of sexual structures in mammals?
A. Embryos develop male structures only once the SRY gene on the Y chromosome. becomes active; if SRY is not present, they develop female structures. B. Embryos initially develop female structures, but these degenerate and male structures develop once SRY becomes active. C. Embryos initially develop both male and female structures; once SRY becomes active, female structures degenerate and male structures continue to develop. D. Embryos initially develop male structures; if SRY is not present, these degenerate and female structures develop. If SRY is present, they continue to develop. E. None of these accurately describes the development of sexual structures in mammals.
Zuzu is a white cat. She is genotype Ww for the "white masking gene" that reduces the number of melanocytes (pigment-containing cells). As a result, her body makes pigment, but it cannot get into the cells where it would color the fur. Zuzu's white masking gene is ________ to the melanin pigment gene because it prevents full expression of the pigment.
A) recessive B) pleiotropic C) epistatic D) dominant
The human immunodeficiency virus specifically targets B cells.
a. true b. false