Which statement about biomes, the major terrestrial ecosystems covering the Earth, is true?
A) Each of the ten major biomes is restricted to just one or two continents.
B) The major factors affecting the distribution of biomes are wind and sunlight.
C) Most natural biomes are unaffected by human activity.
D) Fire is important in some biomes because it creates openings.
fire is very important in some biomes.
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In Bacteria, the MOST common oxidized form of nitrogen is ________ and of sulfur is ________
A) nitrate / sulfate B) nitrate / sulfite C) nitrite / sulfate D) nitrite / sulfite
Daughters of a cross between a white-eyed male and a red-eyed female always have red eyes
A. true B. false
Biochemistry is based on the chemistry of which element?
a. hydrogen b. oxygen c. carbon d. sulfur
Mouse embryonic stem (ES) cells ______________________
(a) can only be produced through therapeutic cloning. (b) can give rise to all tissues and cell types in the body except germ cells. (c) can be implanted in foster mothers to produce cloned cows and other animals. (d) come from the inner cell mass of early embryos.