You count 64 colonies on the 1:1000 plate from the Bacterial Examination of Food exercise. Calculate the number of bacteria per gram of food (CFU/g).
A) 6.4 x 10-4 CFU/g
B) 6.4 x 10-3 CFU/g
C) 6.4 x 104 CFU/g
D) 6.4 x 10-5 CFU/g
C) 6.4 x 104 CFU/g
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Under what condition is the AraC protein an activator?
A) The AraC protein is an activator when it is bound to glucose. B) The AraC protein is an activator when it is bound to lactose. C) The AraC protein is an activator when it is bound to arabinose. D) The AraC protein is an activator when it is bound to cyclic AMP. E) The AraC protein is an activator when it is bound to any sugar molecule.
Which of the following is a component of the spore—or zygote—wall (in mosses, ferns, gymnosperms, and angiosperms) and helps prevent the desiccation of these structures?
A. sporangium B. sporopollenin C. chitin D. peptidoglycan E. sporangia
Which wavelength of light will chlorophyll a absorb?
a. Orange b. Violet c. Yellow d. Green e. Blue
The walled asci contain
a. eight diploid nuclei b. eight haploid nuclei c. many multinucleate conidia d. an egg and a sperm e. a zygote