The accompanying figure represents a:
a. fairly simple food web.
b. fairly simple food chain.
c. pyramid of biomass.
d. pyramid of energy.
e. pyramid of numbers.
c
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Which of the following mechanisms is (are) used to coordinate the expression of multiple, related genes in eukaryotic cells?
A) Environmental signals enter the cell and bind directly to promoters. B) The genes share a single common enhancer, which allows appropriate activators to turn on their transcription at the same time. C) The genes are organized into a large operon, allowing them to be coordinately controlled as a single unit. D) A single repressor is able to turn off several related genes.
When DNA replication begins, _____
a. the two DNA strands unwind from each other b. the two DNA strands condense for base transfers c. two DNA molecules bond d. old strands move to find new strands e. the sugar phosphate backbone is degraded
Tissue whose cells are striated and fused at the ends
by adhering junctions so that the cells contract as a unit is __________ muscle. a. smooth b. skeletal c. visceral d. cardiac e. none of these
Which of the following ocular tissues and infections is mismatched?
A. Keratitis; infection of deep eye tissue B. Conjunctivitis; milky discharge and infection of eyelid lining C. River blindness; microfilariae visible in the vitreous chamber D. Trachoma; infection of epithelial cells