Coliforms are distinguished from non-coliforms by their ability to ferment (glucose/citrate/lactose).
Fill in the blank(s) with the appropriate word(s).
lactose
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Sortase is a protein enzyme of bacteria that
A. directs secretion of proteins across the outer membrane. B. plays a key role in directing proteins to the periplasm. C. catalyzes covalent attachment of some surface proteins to peptidoglycan. D. functions by transporting flagellum proteins to their extracellular site of assembly.
Since viruses have no active methods of entering plant cells, they must rely upon mechanically caused wounds, vegetative propagation of plants, grafting, seed, pollen, and being carried on the mouth parts of chewing insects. Tobacco mosaic virus is most commonly introduced into plants through small wounds caused by handling and by insects chewing on plant parts. What would prevent viruses from easily entering plant cells?
a. The cell wall on the virus b. The plasma membrane on the plant c. The cell wall on the plant d. The plasma membrane on the virus e. The protein coat on the virus
The results of the experiments of Avery and his colleagues indicate that
A. proteins are antigens. B. proteins transfer genetic information. C. capsule formation is mediated by RNA. D. DNA is the transforming material. E. DNA replication is semiconservative.
An unexpected change in a cell's genetic makeup is called a ________.
Fill in the blank(s) with the appropriate word(s).