Why is haplotype diversity greatest in Africa?
A. Human populations that migrated only took a subset of the variable human haplotypes.
B. African populations had a greater mutation rate.
C. Migrating populations had less recombination.
D. Populations migrated to better environments where there was a lower mutation rate.
E. Most migrating populations died out.
A
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Horizontal gene transfer is less prevalent in eukaryotic species because
A. of the presence of organelles in the cells of eukaryotic species. B. of the multicellularity in eukaryotic species, which is laking in prokaryotic species. C. eukaryotic species reproduce by sexual reproduction. D. of multicellularity and sexual reproduction. E. of the presence of organelles and multicellularity.
Tropheryma whipplei is characterized by the presence of periodic acid–Schiff (PAS)–staining macrophages, which indicates mucopolysaccharide or glycoprotein, in almost every organ system. Without treatment, this disease is uniformly fatal. Identification is achieved using:
a. enzyme-linked immunosorbent assay (ELISA). b. IFA. c. immunoblotting. d. real-time polymerase chain reaction (PCR).
External fertilization
A. occurs in amphibians. B. often leaves fertilized eggs susceptible to predation. C. involves the release of eggs and sperm into a body of water. D. requires specialized behavior. E. All of these statements are correct.
When the concentration of glucose in the blood rises following the digestion of a meal, what is the hormonal response?
What will be an ideal response?