Which of the following terms best describes the first primitive eukaryotes?
A) multicellular
B) single-celled
C) photosynthetic
D) specialized
Ans: B) single-celled
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In directional selection, both phenotypic extremes are equally selected against
Indicate whether the statement is true or false
A binomial is always a
(a) genus. (b) specific epithet. (c) scientific name. (d) two-part name.
Which of the following is NOT a characteristic of a morphogen?
A. A morphogen will only elicit effects in areas where it is at a high enough concentration. B. Morphogens are distributed asymmetrically throughout the cell. C. Morphogens can be secreted to act on neighboring cells. D. Morphogens can cause cell death. E. None of these choices are incorrect, they are all characteristics of morphogens.
What are the helper and inducer cells?
A. B cells B. macrophages C. plasma cells D. T cells E. monocytes