Outbreaks of infection with the organism Cyclospora are linked to contaminated raspberries, lettuce, and snow peas. The stain of choice to identify the oocysts in stool samples is:
a. trichrome.
b. Wright's.
c. periodic acid–Schiff.
d. modified acid-fast.
D
Outbreaks of Cyclospora have been linked to contaminated water and various types of fresh produce (e.g., raspberries, basil, baby lettuce leaves, snow peas). Modified acid-fast stains result in the oocysts appearing light pink to deep red, and some will contain granules or have a bubbly appearance, which is described as wrinkled cellophane.
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Which of the following is a photosynthate produced by photosynthesizing leaves?
a. ATP b. sucrose c. glycine d. chlorophyll
Which statement most completely describes why the pea plant was an excellent choice for Mendel's experiments?
a. True-breeding varieties were available. b. The plant can self-fertilize. c. The plant can be cross-fertilized. d. True-breeding varieties were available, and it can be cross-fertilized. e. True-breeding varieties were available, the plant can self-fertilize, and it can be cross-fertilized.
Bipedalism was made possible by
a. movement of the foramen magnum to the base of the skull. b. position and shape of the knee. c. position and shape of the ankle joints. d. position and shape of the pelvic girdle. e. all of these.
An ionic bond forms when
A. an electrical attraction occurs between two atoms of different charge. B. a nonpolar attraction is formed between two atoms. C. a valence electron is shared between two atoms. D. two atoms have similar attraction for electrons.