Which of the following factors does not interfere with the interpretation of evolutionary time using the molecular clock?
A) Horizontal gene transfer
B) Differences in generation time
C) Mutations due to background cosmic radiation
D) Different selection pressures on different taxonomic groups
E) Differences in DNA repair efficiency in different taxonomic groups
C
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Microorganisms are used in which of the following industries?
A) antibiotic B) chemical C) food, beer, and wine D) all of the above
Which solution has the strongest concentration of hydrogen ions?
a. Coffee b. Orange juice c. Tears d. Bleach e. Milk
Organisms that cannot make their own food and must obtain energy from the foods they eat are called
a) autotrophs. b) heterotrophs. c) thylakoids. d) plants.
Bacterial Strain A divides every 30 minutes. If you require at least 4 billion cells to perform an experiment, how many hours will you need to incubate a culture tube inoculated with a single cell of Bacteria A to get enough material to perform your experiment?
A. 4 B. 32 C. 8 D. 16 E. 2