A microbiologist inoculates a flask of broth to a concentration of 100 bacterial cells per ml. The generation time of the species is 1 hour, and there is no lag phase. How long will it be before the culture contains more than 6,000 cells per ml?
A. 12 hours
B. 6 hours
C. 2 hours
D. 4 hours
E. 10 hours
Answer: B
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Serial dilutions can be used to estimate the total number of bacterial cells in a solution, including living and dead cells.
Answer the following statement true (T) or false (F)
All else being equal, selection should more strongly favor reinforcement of reproductive isolation among related species:
A. in allopatric populations over sympatric populations. B. in sympatric populations over allopatric populations. C. in peripatric populations over sympatric populations. D. in peripatric populations over allopatric populations. E. in allopatric populations over peripatric populations.
In skeletal muscle contraction, an increase in ____in the cytosol triggers the crossbridge cycle
a. troponin b. Ca2+ c. tropomyosin d. ATP e. acetylcholine
Which of the following describes a prion?
a. enveloped viral particle with double-stranded DNA enclosed by a capsid b. infectious RNA particle c. infectious proteinaceous particle with no associated nucleic acids d. a simple prokaryote with only a membrane and a nucleoid region