Through what process is O2 transported from air in the lungs into the blood?
a. active transport
b. simple diffusion
c. facilitated diffusion
d. osmosis
e. active transport
B
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E are _______ major families of RNA containing viruses that infect vertebrates
A. 2 B. 5 C. 7 D. 13
When Clausen and colleagues grew genetically identical individuals of the yarrow plant at different elevations, the results are shown in the accompanying figure. This observation verifies that ________
A) yarrow plants mutate quickly when grown in different environments B) the genotypes of yarrow plants has nothing to do with how tall these plants grow C) yarrow plants grow taller at lower elevations and shorter at higher elevations regardless of their genotype D) the genotypes of yarrow plants interacts with environmental influences to produce the phenotype
A zygote contains the __________ complement of chromosomes
a. haploid b. diploid c. polyploid d. spermatogenesis e. none of these
In the laboratory, fruit flies (Drosophila) were artificially selected for the number of bristles on their bodies. One population (R) was selected for low numbers of bristles, a second population (S) for high numbers of bristles.
After 35 generations (about 1 year's time), the two populations R and S were studied. Researchers found
A. a huge increase in S, a huge decrease in R, with no overlap whatsoever. B. no change was seen; it's much too soon. C. a vast, overlapping range of bristle numbers was seen. D. a slight increase in bristles in S, a slight decrease in R, with a little overlap in the middle ranges. E. some slight increase of bristle numbers was already evident.