Antoni van Leeuwenhoek was the first person in history to
A) use a magnifying glass.
B) develop a taxonomic system.
C) view microorganisms and record these observations.
D) disprove spontaneous generation.
E) use the germ theory of disease.
C
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What enables the splicing of group I and II introns?
A. Spliceosomes B. Ribozymes C. snRNA D. Poly-A tail
Where in an insect tracheal system does gas exchange occur between the air and a cell?
a. trachea b. tracheal branches c. gill filaments d. tracheoles e. spiracles
The Darwinian fitness of an individual is measured most directly by
A) the number of its offspring that survive to reproduce. B) the number of ?good genes? it possesses. C) the number of mates it attracts. D) its physical strength. E) how long it lives.
Starting with three cells, how many cells would result from three rounds of replication?
a. Six b. Nine c. Twelve d. Twenty-four e. Forty-eight f. Cannot be determined