Human immunodeficiency virus (HIV) is classified as
A. a retrovirus.
B. a liver carcinogen.
C. a skin-touch transmissable virus.
D. responsive to antibiotics.
E. a general mammalian infectious virus.
A. a retrovirus.
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The prevalence of the allele for sickle cell anemia in some populations is an example of?
A. Heterogeneous environments B. Balancing selection C. Inverted selection D. Non-Darwinian selection E. Nonrandom mating
A frequent complication of untreated gonorrhea in women is
A. pelvic inflammatory disease. B. syphilis. C. dysuria. D. vaginal discharge.
A key difference between eukaryotic and prokaryotic genomes is
a. the lack of controls of gene expression in prokaryotes. b. the physical arrangement of genes on the chromosome(s). c. the near simultaneous transcription and translation that occurs in eukaryotes and is strictly sequential in prokaryotes. d. the physical separation of transcription and translation in prokaryotes compared to no separation of the processes in eukaryotes. e. the regulation of the cell cycle by eukaryotes which is not observed in prokaryotes.
A closed circulatory system usually consists of all of the following except:a
blood. b. pumping organ. c. arteries d. veins. e. hemocoel.