Enzymes are
A) Proteins that function as catalysts
B) Used up in chemical reactions
C) All of these choices are correct
D) Not needed for catabolic reactions
E) Broken down in reactions that require energy input
A) Proteins that function as catalysts
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The type of cooperation between two species of a community that is based on satisfying the needs of both species is called
A. commensalism. B. mutualism. C. parasitism. D. predation.
Which Ecdysozoan phylum includes insects, spiders, crustaceans, millipedes, and centipedes?
a. Onychophora b. Nematoda c. Arthropoda d. Nemertea
Green and purple sulfur bacteria will carry out anaerobic photosynthesis primarily in
A. zone 1. B. zone 2. C. zone 3. D. zone 4. E. both zones 1 and 2.
Approximately ________ years ago, atmospheric oxygen reached its current concentration (i.e., ~21 percent)
a. 100–500 million b. 600–900 million c. 1–2 billion d. >2 billion