Which phylum of vascular, seed-bearing plants has only about 70 living species in three genera, including Welwitschia and Ephedra?
a. Anthophyta
b. Ginkgophyta
c. Gnetophyta
d. Coniferophyta
Ans: c. Gnetophyta
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The rate of diffusion through a selectively permeable membrane will be lowest when ____
I. concentration gradients are steep II. temperatures are low
III. solutes are small moleculesa. I only b. II only c. I and III d. II and III e. I, II, and III
Which statement is true?
a. The anterior pituitary gland is essentially nervous tissue. b. The anterior pituitary gland secretes only two hormones. c. Only the posterior part of the pituitary gland could be called the "master gland." d. The posterior pituitary gland only stores hormones produced by the hypothalamus. e. The anterior pituitary gland is conencted to the hpothalamus via the infindibulum.
"K" is the chemical symbol for
A. phosphorus. B. potassium. C. nickel. D. krypton. E. copper.
A mixed culture is
A. one that has been adequately stirred. B. a pond sample containing algae and protozoa. C. one that contains two or more known species. D. the same as a contaminated culture.