Biological diversity is composed of what three levels?
A. trophic diversity, ecosystem diversity, and species diversity.
B. ecosystem diversity, species diversity, and process diversity.
C. genetic diversity, function diversity, and process diversity.
D. genetic diversity, species diversity, and ecosystem diversity.
D. genetic diversity, species diversity, and ecosystem diversity.
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In Bacteria, a chromosome can be distinguished from a plasmid, because a chromosome is a genetic element that
A) is circular. B) is linear. C) encodes for essential functional genes. D) replicates via a bidirectional fork.
Suppose you discovered a new mutation in mice that causes a curved spine. You noticed that this mutant phenotype is present only in females. When curved-spine females are crossed with normal males, the progeny are always recovered in a 1:1:1 ratio of curved-spine females, normal females, and normal males. Explain the genetic basis for this ratio.
A) hemizygous or homozygous lethal autosomal allele B) hemizygous or homozygous lethal sex-linked allele C) recessive sex-linked allele D) recessive autosomal allele E) dominant sex-linked allele
Grass, mice, snakes, and hawks living together in the same geographic area constitute a/an
A. ecosystem. B. abiotic factor. C. community. D. environment.
How does HIV know which cells to infect?
A. It can infect cells with particular surface receptors. B. It can infect any cell it comes in contact with. C. It can only infect cells that are actively growing and dividing. D. It only infects cells that line the reproductive tract. E. It can only infect cells on surfaces of the body where the temperature is lower.