The species of Staphylococcus, which is one of the most important human pathogens, is:
a. S. lentus.
b. Staphylococcus aureus.
c. S. mucilaginosus.
d. Staphylococcus intermedius.
B
A wide spectrum of factors, not all of which are completely understood, contribute to this organ-ism's ability to cause infections and disease. Several toxins and enzymes mediate tissue invasion and survival at the infection site.
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A ____ gene determines the structure of body parts during embryonic development
a. homoplasy b. homeostatic c. homologous d. homeobox e. homogenous
Which of the following is (are) true concerning
tetanus? a. The pathogen spreads through the air. b. The pathogen is ingested through tainted canned food. c. The pathogen is a virus. d. Blood or nerves deliver the toxin to the spinal cord and brain. e. All of these are true.
A Barr body is normally found in the nucleus of which kind of human cell?
A) unfertilized egg cells only B) sperm cells only C) somatic cells of a female only D) somatic cells of a male only E) both male and female somatic cells
Which one of the following best describes the difference between artificial and natural selection?
a) Charles Darwin understood natural selection but was unaware of artificial selection in his time. b) Natural selection's effectiveness is limited by physiological and developmental constraints; artificial selection's effectiveness is free of these constraints. c) Artificial selection has produced many unwanted genotypes; natural selection has not. d) Natural selection works on all species; artificial selection will only work on lab-reared species. e) Natural selection can act without the input of humans; artificial selection requires some human input.