In angiosperms, pollen must complete mitosis to produce gametes. Therefore pollen are which of the following?
A. sporophytes
B. eggs
C. seeds
D. sperm
E. gametophytes
Answer: E. gametophytes
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If a mutation prevented the formation of lignin,
which tissue would be most affected?
a. vascular cambium b. parenchyma c. collenchyma d. sclerenchyma e. all of these
Destructive outbreaks of pests are ____ in cultivated fields, which are low-diversity communities, than in natural
communities with greater species richness. a. less common b. more common c. equally common d. most easily prevented e. rarely occur
Free radicals are considered dangerous because they
A) damage oxygen and cause it to become an antioxidant. B) emit dangerous radiation. C) attack the atomic nucleus. D) steal electrons from other atoms, causing those atoms to become unstable.
Whereas most extreme halophiles use compatible solutes to maintain an osmotic balance (and avoid desiccation), which genus below does NOT?
a. Archaeoglobus b. Halobacterium c. Picrophilus d. Salinibacter