The most common molecules in cellular membranes are the
a. glycolipids.
b. phospholipids.
c. cholesterol molecules.
d. proteins.
Ans: b. phospholipids.
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Identify the animal with the most advanced cephalization
a. a flatworm b. an arthropod c. a chordate d. a mollusk e. an echinoderm
DNA profiling relies on an individual's ________, no two of which are the same between different people, except identical twins.
A. unique set of short tandem repeats within DNA B. unique set of genes C. unique mRNA sequences D. unique fingerprints
Oral infections with herpes simplex virus 1 can lie dormant in nerve cells for years, and when a patient becomes stressed, the virus is released, forming cold sores on the lips. Why would the virus form a cold sore?
a. To allow it to spread to a new host b. So that it can mutate and survive an antibiotic treatments c. To move to another part of the body d. To avoid the immune system e. To warn other people that the host is infected
Which of the following situations might cause normal microbiota to become opportunistic pathogens?
A) growth of microbes on the surface of intact skin B) growth of microorganisms on the excreted cellular wastes and dead cells in the large intestine C) treatment of a cancer patient with radiation D) growth of Lactobacillus on the surface of teeth E) presence of Entamoeba in the lumen of the colon