Haplogroups consist of
A) sets of species that share a recent ancestor.
B) the set of Y chromosomes in a population.
C) groups of SNPs that are linked on a chromosome.
D) preserved gametes, which are haploid.
C) groups of SNPs that are linked on a chromosome.
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Which cells alert the adaptive immune system when they detect antigens?
a. eosinophils b. B and T cells c. macrophages d. dendritic cells e. cytokines
Which one of the following experiments would be considered acceptable in our society?
A) Determining the effects of cocaine use on babies born to cocaine-using mothers. B) Determining the response of a patient's "incurable" cancer to a newly developed cancer drug. C) Testing the effects of radiation exposure on volunteers. D) Testing the effectiveness of a new AIDS vaccine using deliberate exposure of human volunteers to HIV. E) Testing the effectiveness of a newly developed antibiotic using deliberate exposure of humans to antibiotic-resistant bacteria.
The greatest number of bacteria forming the normal flora are found:
A. On the skin B. In the mouth C. in the large intestine D. in the vagina E. in the nose
The yeasts mostly belong to which group?
A. basidiomycetes B. zygomycetes C. ascomycetes D. imperfect fungi