What cytoskeletal protein is important to the function of the sperm cells illustrated in Figure 11.13?
A. microfilaments
B. intermediate filaments
C. microtubules
D. All of the above are correct.
C
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A major difference between allopatric and sympatric speciation is whether
A. resulting species are reproductively isolated or not. B. gene flow continues to occur or not. C. two or three species result. D. geographic isolation is required or not. E. the new species are separated by a prezygotic or postzygotic isolating mechanism.
Suppose that a person has a mutation in a gene that encodes an enzyme responsible for the production of histamine. In this person, mast cells cannot produce and secrete histamine. Which of the following outcomes is most likely to happen if an injury
occurs? A) Macrophages will not be able to secrete signaling molecules. B) Neutrophils will not be attracted to the injury site. C) Neutrophils will not be able to phagocytose pathogens at the injury site. D) Macrophages will not be attracted to the injury site.
Organisms called ________ live on or in the body of a host and cause some degree of harm.
A. pathogens B. mesophiles C. commensals D. halophiles E. aerobes
Describe the interactions between genes and the environment in the sex determination of some reptiles; explain their relevance to human sex determination
What will be an ideal response?