When it is important to count the number of cells, determine cell size, and differentiate between dead and live cells, a(n) ________ is used.
A. spectrophotometer
B. SEM
C. Coulter counter
D. flow cytometer
E. methylene indicator dye
Answer: D
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In the 1940's, biologist Adolph Murie studied survival in Dall sheep in what is now Mount Danali National Park in Alaska
He found that Dall sheep that survive their first year of life have a high probability of surviving until they are around 9 years old; after that, they rapidly become easy prey for wolves and die at a very high rate. This pattern best fits a type ____ survivorship curve. Fill in the blank with the appropriate word.
The transmission of leprosy is by
A. direct human-to-human contact. B. the fecal-oral route. C. contact with infected blood products. D. contact with infected nasal secretions. E. direct human-to-human contact AND contact with infected nasal secretions.
In C4 plants, which of the following events of
photosyntesis takes place first?
a. carbon from carbon dioxide is fixed by an enzyme that does not use oxygen b. carbon from carbon dioxide is fixed by rubisco c. glucose is produced d. glucose is converted into sucrose e. RuBP splits into two PGA molecules
Select the characteristics that are used in the morphological identification of microorganisms.
A. Salt tolerance B. Temperature growth range C. Presence of cilia and flagella D. Cell shape E. Staining behavior F. Fermentation products