Maintaining the ozone layer is crucial for life because it
a. absorbs visible light.
b. absorbs high-energy UV radiation.
c. blocks high-energy IR radiation.
d. blocks low-energy IR radiation.
e. absorbs low-energy UV radiation.
Ans: b. absorbs high-energy UV radiation.
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Tamoxifen blocks the activity of estrogen in ____, but increases the activity of estrogen in ____
a. breast tissue; ovarian tissue b. uterine tissue; ovarian tissue c. uterine, tissue; breast tissue d. breast tissue; uterine tissue e. brain tissue; breast tissue
Which of these statements is NOT correct about flatworms?
A. Flatworms are deuterostomes. B. The embryos of flatworms are triploblastic. C. Flatworms have a sac body plan with an incomplete gut. D. Flatworms are in phylum Platyhelminthes. E. Flatworms are free-living or parasitic.
Most often, the largest gradient in water potential is between
A. roots and soil water. B. root xylem and shoot xylem. C. leaf cells and the intracellular spaces inside the leaves. D. xylem and phloem. E. the relative humidity inside the leaf and the relative humidity outside the plant.
In humans, the thirst center is located in the
a. adrenal cortex. b. hypothalamus. c. anterior pituitary. d. glomerulus