Which of the following statements is (are) true?
a. The anterior pituitary gland is essentially
nervous tissue.
b. The anterior pituitary gland secretes only two
hormones.
c. The posterior pituitary gland is the master gland.
d. The posterior pituitary gland only stores and
releases hormones produced by the
hypothalamus.
e. All of these are true.
Answer: d
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A cerebrospinal fluid (CSF) culture was performed on a newborn in distress. After overnight incubation, small gram-positive bacilli with a soft zone of <-hemolysis grew on sheep blood agar. Based on this information, what results would be expected on the following tests: hippurate; Christie, Atkins, Munch-Petersen (CAMP); and motility?
a. Negative hippurate, positive CAMP, and negative motility b. Positive hippurate, negative CAMP, and positive motility c. Positive hippurate, positive CAMP, and positive motility d. Negative hippurate, negative CAMP, and negative motility
Four __________ glands make a hormone that acts on bone and kidney cells and raises blood calcium
level. Fill in the blank(s) with the appropriate word(s).
Some members of the species D. bifasciata produce mostly female offspring if reared at or below 21°C. The causative agent of this condition (called sex ratio) is a protozoan infection that is lethal to most male larvae
How can you demonstrate that it is both inherited and extrachromosomal? A) Inject ooplasm of affected females into normal females and then mate these with normal males. B) Inject cytoplasm from somatic cells of an affected female into normal females and then mate them with normal males. C) Mate affected females with normal males and assess daughter somatic cells for presence of the protozoan. D) Perform reciprocal crosses of affected and normal individuals and examine the offspring for infection. E) Perform reciprocal crosses of affected and normal individuals and look for affected male offspring.
Scientists have a complete fossil record showing the evolution of horses over millions of years, with the legs becoming longer and the teeth larger, as ancestors of the modern horse adapted from living in forest to grasslands. This is an example of
A. punctuated equilibrium. B. extinction. C. a postzygotic barrier to evolution. D. gradualism. E. a prezygotic barrier to evolution.