Ingesting lactic acid bacteria to prevent colonization by intestinal pathogens such as Salmonella enterica during antibiotic therapy is an example of ________.
A) chemotherapy
B) vaccination
C) probiotics
D) parasitism
E) opportunism
Ans: C) probiotics
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The organelle responsible for harvesting light as an energy source for photosynthesis is the
A. kinetoplast. B. mitochondrion. C. centriole. D. chloroplast.
Select the three layers of the human eye.
a. sclera b. choroid c. retina d. all of the above
You have constructed a genomic library of Felis catus (domestic cat) in E. coli. You extract the plasmid DNA from the clones, digest the plasmid with restriction enzymes, separate the resulting fragments by gel electrophoresis,
and transfer the fragments to a nylon membrane by the Southern blot procedure. You then use a fluorescently labeled probe that is complementary to a gene of interest that may be involved in feline lymphoma. The DNA corresponding to one clone yields a single fluorescent DNA band after probing the Southern blot. Based on this information A) all of the clones tested, except the one described, have the gene of interest. B) only the one clone described has the gene of interest. C) the gene of interest is located entirely on the fluorescent DNA band. D) the part of the gene complementary to the probe is located on the fluorescent DNA band. E) only the one clone described contains the part of the gene complementary to the probe on the fluorescent DNA band.
What is the final outcome of meiosis?
A. Four genetically identical cells B. Four genetically non-identical cells C. Two genetically identical cells D. Two genetically non-identical cells