Why are conifers and cycads considered gymnosperms?
A. They have true vascular tissue but do not form seeds.
B. The female gametophyte is not completely enclosed in sporophyte tissue at the time of pollination.
C. The fruit is not fleshy.
D. The pollen is wind dispersed.
E. Pollination and fertilization occur at different times.
B. The female gametophyte is not completely enclosed in sporophyte tissue at the time of pollination.
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Both pulse-field gel electrophoresis and Western blotting utilize electrophoresis in their procedures. When comparing the two procedures, which statement is true?
A. Pulse-field gel electrophoresis is excellent for identifying minute genetic differences among strains of one species of an organism. B. Pulse-field gel electrophoresis separates DNA fragments while Western blotting separates proteins. C. The presence of antibodies in a patient specimen can be identified in the Western Blot. D. Pulse-field gel electrophoresis is used for genetic analysis. E. All of the statements are true.
Which of the following is NOT a way medical professionals can combat and delay the evolution of antibiotic resistance bacteria?
A. Combining certain drugs safely to treat infections B. Encouraging patients to take mild doses of antibiotics for small or chronic illness over longer periods of time C. Encourage patients to take the entire regiment of their antibiotic prescription, not just until they feel better D. Cutting back on preventative antibiotic treatments in food stores such as crops and livestock E. Using antibiotics to treat only bacterial infections, not viral infections
Word Bacillus may refer to
a) rod-shaped cells. b) spherical cells. c) spiral-shaped cells. d) a specific genus. e) rod-shaped cells and a specific genus.
The "rain shadow" effect occurs because:
A) air cools as it rises and drops most of its moisture on one side of the mountain, and then mostly dry air moves to the other side of the mountain. B) cool air masses warm as they move closer to the sun, dropping moisture on the west side of mountains. C) cloud shadows move from east to west, dropping moisture on the east of mountain ranges in the northern hemisphere. D) clouds don't drop moisture over mountain chains. E) precipitation patterns follow the tilt of Earth's axis.