The experimental design in Figure 13-1 was used to examine:
a. the relationship between genetic changes and metabolic enzymes.
b. the mutation rate of Neurospora.
c. resistance of Neurospora to genetic poisons.
d. toxicity of arginine metabolites.
e. growth of Neurospora in the presence of different antibiotics.
A
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Which of the following statements is true of the bryophyte gametophyte generation?
A. It is diploid. B. It produces spores. C. It is unicellular. D. It is dominant. E. It is dependent on the sporophyte.
Top-down factors that can control the population sizes of plants or animals include which of the following factors? Select all that apply.
_____ the density of herbivores _____ an extended period of drought _____ healthy populations of secondary carnivores _____ the presence of a fungal pathogen _____ nutrient-poor soil _____ levels of primary producers in the ocean
In a healthy male, how many sperm cells would be expected to form from (a) 400 primary spermatocytes? (b) 400 secondary spermatocytes?
A) (a) 1600; (b) 800 B) (a) 800; (b) 800 C) (a) 400; (b) 400 D) (a) 400; (b) 800 E) (a) 1600; (b) 1600
Gloves, lab coat, eye protection, and/or face shield, plus biosafety cabinets used for all manipulations are the appropriate primary barriers for which level of organism?
A) BSL-1 B) BSL-2 C) BSL-3 D) BSL-4