Antibodies that have arisen in the blood plasma without any obvious or deliberate stimulus are called
A. natural.
B. acquired.
C. injurious.
D. active.
A
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Sterilization can be accomplished by use of:
A) an autoclave. B) antiseptics. C) medical aseptic techniques. D) pasteurization.
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
Which of the following is a lophotrochozoan protostome?
a. arthropods b. cnidarians c. mollusks d. chordates e. nematodes
A ________ can contain DNA or RNA as its genetic material, but not both.
Fill in the blank(s) with the appropriate word(s).