The ozone layer is valuable because it blocks
a. heat.
b. UV radiation.
c. radio waves.
d. asteroids.
e. X-rays.
ANSWER: b
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Which of the following statements best describes the condition of fungal spores?
A. Sexual and asexual spores are both haploid. B. Sexual and asexual spores are both diploid. C. Sexual spores are haploid and asexual spores are diploid. D. Sexual spores are diploid and asexual spores are haploid. E. Haploid asexual spores fuse to form diploid sexual spores.
Pollination in most cycads usually occurs when ____ transfer pollen from male plants to the developing gametophyte
on female plants.
a. beetles b. mosquitoes c. honeybees d. butterflies e. ants
One surprise from comparative genome projects is that
A) all species examined so far have the same genes. B) we do not know the function of a great many genes. C) small organisms can have large genomes. D) large organisms can have small genomes.
Using PGD to screen for embryos that would become suitable donors for siblings is illegal under any
circumstance. Indicate whether the statement is true or false.