What is the hydrogen sulfide indicator in the Lysine Iron Agar?
A. Ferric ammonium citrate
B. Sodium thiosulfate
C. Bromocresol purple
D. Ferrous sulfate
Ans: A. Ferric ammonium citrate
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How many of the following are characteristics of at least some members of the phylum Cnidaria?
1. a gastrovascular cavity 2. a polyp stage 3. a medusa stage 4. cnidocytes 5. a pseudocoelom A) 1 B) 2 and 3 C) 3, 4 and 5 D) 1, 2, 3, and 4 E) 1 and 2
Which of the following is a true statement about asexual reproduction in plants?
A) Clones of plants do not occur naturally. B) Cloning, although achieved in animals, has not been demonstrated in plants. C) Making cuttings of ornamental plants is a form of fragmentation. D) Reproduction of plants by cloning may be either sexual or asexual. E) Viable seeds can result from asexual reproduction only.
A bacterial cell must have ___________ in order to transfer portions of its chromosome to another cell.
A. an F factor B. a high frequency of combination plasmid C. a recombination factor D. growth enhancement genes E. all of these components
Which of the following are the most abundant cell type found in most plants?
A) parenchyma cells B) collenchyma cells C) sclerenchyma cells D) food-conducting cells