The large number of alveoli in mammalian lungs, the numerous lamellae in fish gills, the papulae of echinoderms, and the extensive tracheal system of insects are all adaptations that optimize what factor in the formula for Fick's law of diffusion?
A. A
B. d
C. ?p
D. D
Answer: A
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Postzygotic isolating mechanisms occur when the offspring
a. survive to reproductive age. b. have vigorous health. c. inherit the same numbers of chromosomes from each parent. d. inherit different sets of instructions for development from each parent. e. have hybrid viability.
Assume a double crossover occurs in this pair of chromosomes that results in chromatids of the genotypes A b C and a B c. If the first crossover (the one between A and B) involves chromatids 1 (A B C) & 4 (a b c), which chromatids could be involved in the second crossover?
Consider a pair of homologous chromosomes heterozygous for three genes (e.g. A B C / a b c) during prophase I of meiosis. Let the sister chromatids of one homolog be numbered 1 and 2; and the sister chromatids of the other homolog be numbered 3 and 4. A) 1 & 2 B) 3 & 4 C) 1 & 3 D) 2 & 4 E) 1 & 4 F) 2 & 3
When the cell wall is removed from a Gram-negative bacterium without removing the outer membrane, the resulting form is called a(n) ________.
Fill in the blank(s) with the appropriate word(s).
The tertiary stage of syphilis
A) Is when gummas develop in tissues. B) Occurs within 10 days of the primary stage. C) Is when a chancre develops. D) Is when the patient is highly infectious to others. E) Has no symptoms