Each of the following is true about homeoviscous adaptation in membranes except
A) maintains membrane viscosity despite changes in environmental temperature.
B) may decrease the average length of membrane lipid fatty acid tails.
C) may increase the unsaturation of membrane lipid fatty acid tails.
D) occurs primarily in homeothermic (warm-blooded) organisms and only rarely in poikilothermic (cold-blooded) organisms.
E) may increase the proportion of cholesterol in animal cell membranes.
Answer: D
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A student complains that it makes no sense to worry about coliform bacteria in water, since we naturally possess harmless coliforms in our intestines anyway. Why do regulatory agencies worry about coliform bacteria in water supplies, then?
A. The coliforms in our intestines can sometimes turn harmful, causing intestinal infections. We need to constantly be on guard against this happening. Coliforms in water might add to this potential problem. B. Not all coliforms are harmless and symbiotic with human beings. Some may carry genes/proteins that can make them dangerous to humans. It's best to keep coliforms OUT of our drinking water, since it's difficult to identify which ones might be harmless and which ones might be harmful. C. Regulatory agencies are worried that multiple types of coliforms in water might lead to greater antibiotic resistance in the bacterial populations. They try to keep them out of water to keep antibiotic resistance levels down. D. Regulatory agencies simply need something to do to justify their existence. There is no real danger from coliforms in water supplies.
The tissue located between the cortex and the vascular cylinder in a root is called the
a. endodermis. b. epidermis. c. meristem. d. parenchyma
what is the effect of botulism toxin?
What will be an ideal response?
Members of the class ________, which include octopuses, squids, and nautiluses, are highly intelligent.
What will be an ideal response?