Food-borne pathogens are most commonly identified by
A. standard culture techniques.
B. polymerase chain reaction (PCR).
C. pulsed-field gel electrophoresis.
D. None of the choices are correct.
Answer: A
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____ are starch-containing organelles present in root cells that sink toward one side of the cell in response to gravity (and thus play a role in gravitropism)
Fill in the blank with the appropriate word.
The present rate of species loss ________
A) suggests that about 25% of all plant and animal species may be extinct by the end of the century B) is about the same as it has been during the last 100,000 years C) is as much as 100 times higher than at any time in the last 100,000 years D) is slower than in recent years because of conservation efforts
Which of the following form chains with overlapping ends to form a system of water-carrying tubes, and are dead when mature?
A) collenchyma cells B) sclerenchyma cells C) water-conducting cells D) food-conducting cells
What major benefits do plants and mycorrhizal fungi receive from their symbiotic relationship?
A) Plants receive enzymes, and fungi receive nitrogen and phosphorus. B) Plants receive increased root surface area, and fungi receive digestive enzymes. C) Fungi receive photosynthetic products in exchange for living in plant root nodules. D) Plants receive nitrogen and phosphorus, and fungi receive photosynthetic products.