Which airborne pollutant contributes to global warming?
a. carbon dioxide
b. ozone
c. mercury
d. sulfur dioxide
e. carbonic acid
ANSWER: a
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Gene S controls the sharpness of spines in a type of cactus. Cactuses with the dominant allele, S, have sharp spines, whereas homozygous recessive ss cactuses have dull spines. At the same time, a second gene, N, determines whether or not cactuses have spines. Homozygous recessive nn cactuses have no spines at all. A cross between a true-breeding sharp-spined cactus and a spineless cactus would produce_____.
A) all sharp-spined progeny B) 50% sharp-spined, 50% dull-spined progeny C) 25% sharp-spined, 50% dull-spined, 25% spineless progeny D) all spineless progeny E) It is impossible to determine the phenotypes of the progeny.
________ allows fish to camouflage themselves to avoid predators or ambush prey
a. Obliterative countershading b. Disruptive coloration c. Aposematic coloration d. Cryptic coloration
What is a likely reason that tropical trees develop buttress roots?
(a) They are needed for oxygen exchange (b) They prevent that smaller animals and vines have easy access to the tree trunk (c) They are used as storage reserve for the tree (d) They provide the trees with additional stability support (e) They look good
Which statement about the phosphorus cycle is false?
A) The main abiotic reservoir for phosphorus is in the water. B) Plants release dissolved phosphate ions into the soil. C) Phosphates that drain from soils into the sea become part of new rock and will cycle back into living organisms. D) Guano can be used by farmers to add phosphorus to the soil.