The Pap test for cervical cancer involves microscopic examination of cervical cells for cancerous cells. A new, rapid diagnostic test to detect human papilloma virus (HPV) DNA before cancer develops is done without microscopic exam. The steps involved in this FastHPV test are listed below. What is the second step?
a. Add an RNA probe for HPV DNA.
b. add enzyme substrate.
c. Add enzyme-linked antibodies against DNA-RNA.
d. Lyse human cells.
e. The order is unimportant.
Answer: a. Add an RNA probe for HPV DNA.
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Parasites represent an unusual type of predation in that the parasite typically ________
a. does not kill its host (prey) outright b. completes its life cycle within the host c. is significantly smaller than the organism it preys upon d. all of the choices
The principal place in the human ear where sound waves are amplified by means of the vibrations of tiny bones is the:
a. pinna b. ear canal c. middle ear d. organ of Corti e. inner ear
Plants became erect, taller, and branched as a result
of their ability to produce a. cutin. b. lignin. c. cellulose. d. complex carbohydrates. e. suberin.
Given the following table:
Supplement 1 2 3 4 Strain A + - + - Strain B + + + - Strain C + + + + Strain D - - + - where numbers 1 through 4 indicate four supplements that must be added to sustain growth of the organism, determine a possible metabolic pathway that would give the results seen for the four mutant strains, A through D.