Assume that having three nostrils is inherited as a sex-linked trait on the Y chromosome. A man with three nostrils has a daughter who has a son with a man who has only two nostrils. What is the probability that the three-nostril man's grandson has three nostrils?
A. 25%
B. 0%
C. 100%
D. 50%
B. 0%
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Flagella move:
A. in an oarlike motion by the motor protein dynein sliding microtubules past each other. B. in an oarlike motion by the motor protein kinesin sliding microtubules past each other. C. in a whiplike motion by the motor protein dynein sliding microtubules past each other. D. in a whiplike motion by the motor protein kinesin sliding microtubules past each other. E. in a whiplike motion by the motor protein dynein sliding microfilaments past each other.
A particular segment formed during normal Drosophila development
A. will always form the same structures in adult flies. B. can form different structures, depending on positional information received by the segment during early development. C. is only important to early developmental stages. D. will express different transcription factors in different individuals. E. will become ectoderm, endoderm, or mesoderm.
Primates, as well as dogs, sheep, and horses, have died of central nervous system (CNS) infections with which organism?
a. N. fowleri b. Acanthamoeba spp. c. Toxoplasma gondii d. Balamuthia mandrillaris
Which of the following statements about soil is false?
A. the O and A horizon has the greatest physical, chemical, and biological activity B. the A horizon is the topsoil C. the B horizon is the subsoil D. the R horizon is bedrock or parent material E. none of the above are false