When you see a fern, the large plant you are looking at is the
A. gametophyte.
B. endosperm.
C. antheridium.
D. rhizoid.
E. sporophyte.
Answer: E
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When Ron Evans generated transgenic mice in which the gene PPAR-delta was constitutively active (i.e., always expressed), he found that these mice showed a shift from fast glycolytic fibers to slow oxidative fibers. One consequence of this anatomical change would be that the transgenic mice
A. were more likely to become obese than wild-type (nontransgenic) mice. B. showed less endurance in a running test. C. showed greater endurance in a running test. D. had leg muscles with lower mitochondrial and capillary densities than wild-type (nontransgenic) mice. E. had muscles that were not as red as those of wild-type (nontransgenic) mice.
Sperm-producing cells are referred to as
a. spermatocytes. b. Sertoli cells. c. interstitial cells. d. seminiferous cells. e. spermatogenic cells.
While the transports dissolved organic nutrition molecules, such as sugars, from the leaves after photosynthesis, the transports water and dissolved minerals from the soil to the shoots and leaves.
A. tracheids; vessel elements B. phloem; xylem C. ground tissue; dermal tissue D. wood; meristem E. xylem; phloem
Ovulation is triggered primarily by
a. a surge of LH that occurs halfway through the menstrual cycle. b. the falling levels of estrogen and progesterone. c. the rising levels of progesterone. d. both a surge of LH that occurs halfway through the menstrual cycle and the rising levels of progesterone. e. the formation of a polar body.