________ are required organic compounds because they are essential cell components or precursors of such components that cannot be synthesized by the organism. (2 words)
Fill in the blank(s) with the appropriate word(s).
Growth factors
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Recent climate simulations suggest that angiosperms may have been necessary for the formation of tropical rainforests as we know them today
A. true B. false
Which of the following cytoskeletal proteins would be expected to be involved in binary fission of a bacterium into two bacteria?
A) FtsZ B) MreB C) plectin D) crescentin E) tubulin
A microbiologist inoculates Staphylococcus aureus into a culture medium. Following incubation, both Staphylococcus aureus and Staphylococcus epidermidis are determined to be growing in this culture. What is the most likely explanation?
A. The microbiologist used too much inoculum. B. The incubation temperature was incorrect. C. The culture medium must be selective. D. The culture is contaminated. E. The culture medium must be differential.
Which of the following microbial forms have the highest resistance to physical and chemical controls?
A. naked viruses B. fungal spores C. yeast D. bacterial endospores E. protozoan cysts