What do autotrophs require in order to produce food for themselves and all the heterotrophs?
A. an energy source, inorganic nutrients
B. an energy source, water
C. sunlight, inorganic nutrients
D. heat, water
E. sunlight, organic nutrients
Answer: A
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A scolex is:
a. the anterior attachment organ of a tapeworm b. the feeding organ of a fluke c. an appendage of a sandworm d. the egg of a sea star e. the larva of an aquatic insect
How does the lipopolysaccharide from Neisseria differ from other Gram-negative bacteria?
A. it activates B cells B. It lacks endotoxin activity C. It is formed of a longer chain of polysaccharides D. it is formed of a shorter chain of polysaccharides
Tandem duplication of a gene may be a result of
a. deletions. b. a recombination error. c. gene conversion. d. translocation. e. point mutation.
Where does the Calvin cycle occur?
a. thylakoid membrane b. thylakoid lumen c. stromal lamellae d. cytosol e. stroma