Which type of medium suppresses the growth of unwanted bacteria and encourages growth of desired microbes?
A. differential media
B. complex media
C. selective media
D. enrichment media
Ans: C. selective media
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Which statement about microscopes is true?
a. Transmission electron microscopes show details of the internal structures of cells. b. Electron microscopes are best for viewing live cells because of high resolving power. c. Light microscopes require the use of stains which typically kill cells. d. Dissecting microscopes have a higher magnification than light microscopes.
Guard cells
a. surround the stoma. b. control the flow of gases between the interior of a leaf and the atmosphere. c. become turgid when it becomes light if environmental conditions are not too hot or too dry. d. may absorb water from surrounding epidermal cells. e. do all of these.
The cross section in Figure 31-6 is representative of the internal structures found in:
A. phoronids.
B. nemerteans.
C. Diplopoda.
D. Polyplacophora.
E. oligochaetes
Smallpox is caused by infected rats
Indicate whether the statement is true or false