All of the following are criteria that are used to classify different types of microbiological growth media EXCEPT
A. chemical composition.
B. sensory characteristics (color, smell).
C. physical state or consistency.
D. purpose or function.
Answer: B
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PPD (purified protein derivative) or tuberculin is injected intradermally to test whether an individual is infected with tuberculosis. After 48-72 hours post-injection, the test is read by measuring:
A.The intensity of the red coloration of the injection site B. The number of blebs or wheals at the injection site C. The diameter of the bleb or wheal D. The distance the bleb or wheal forms from the injection site
Viruses are known to infect Bacteria, but no virus has yet been found that infects Archaea
Indicate whether the statement is true or false.
In this polymerase chain reaction, heat is applied _____
1.between steps A and B
2.during step C
3.whenever synthesis is taking place
4.in the final annealing step
Crossing over
a. increases variability in gametes. b. happens only once per homologue pair. c. occurs between sister chromatids. d. prevents genetic recombination. e. is followed immediately by separation of the chromatids.