Assume that a pinhead is 1 mm in diameter. How many spherical bacteria (cocci), lined up side- by-side, would fit across the pinhead.
A) 100
B) 1,000
C) 10,000
D) 100,000
B) 1,000
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How does gene flow affect the genetic composition in populations?
A. Gene flow promotes genetic diversity by introducing new alleles into populations. B. Gene flow tends to make the allele frequencies in neighboring populations more similar to each other. C. Gene flow promotes genetic diversity by introducing new alleles into populations and gene flow tends to make the allele frequencies in neighboring populations more similar to each other. D. Gene flow promotes genetic similarities by removing alleles from a population.
Fever help the body fight infection in all of the following ways except:a
Increased body temperature increases phagocytosis. b. Fever causes the breakdown of lysosomes, which destroys infected cells. c. Fever inhibits the growth of some microorganisms. d. Fever promotes lymphocyte activity. e. Fever increases capillary permeability
A DNA fingerprint of a suspect doesn't match a DNA fingerprint from a blood sample taken at a crime scene. What can you conclude?
A) The suspect was never at the crime scene. B) The blood sample was probably degraded or destroyed in some way. C) There is no DNA in a blood sample. D) The blood came from a different person, but the suspect may have been there.
Which of the following antimicrobials works by inhibiting the functions of the cell membrane?
A) polymyxin B) penicillin C) tetracycline D) vancomycin