High titers of specific antibodies are components of
A. toxoids.
B. attenuated vaccines.
C. immune serum globulin (ISG).
D. specific immune globulin (SIG).
E. gamma globulin.
Answer: D
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An animal that is attached to the substrate and cannot move from one place to another is said to be
A. rooted. B. sessile. C. sedentious. D. fixated.
In garden peas, one pair of alleles controls the height of the plant, and a second pair of alleles controls
flower color. The allele for tall (D) is dominant to the allele for dwarf (d), and the allele for purple (P) is dominant to the allele for white (p). A tall purple crossed with a tall purple produces 3/4 tall purple and 1/4 tall white. What is the genotype of the parents? What will be an ideal response?
Rimantadine is an effective antimicrobial agent against:
A) viruses B) protozoa C) bacteria D) fungi
A scientist is studying a population of crickets and finds that there is variation in the songs used by males to call for mates. Some males call with high-pitched three-chirp songs and some call with low-pitched four-chirp songs. However, offspring from the two types of males are able to interbreed so the scientist classifies the population as a single cricket species and goes on to another project. One year later a mutation arises in a female cricket that makes her unable to hear high frequencies. Ten years later a graduate student returns to the same cricket population and discovers that there are now two distinct cricket species in the area although they appear morphologically identical. What is the most likely explanation?
A. Gametic isolation has led to sympatric speciation. B. Habitat isolation has led to allopatric speciation. C. Temporal isolation has led to allopatric speciation. D. Mechanical isolation has led to sympatric speciation. E. Sexual selection has led to sympatric speciation.