You are given the task of designing an aquatic protist that is a primary producer. It cannot swim on its own, yet must stay in well-lit surface waters. It must be resistant to physical damage from wave action. It should be most similar to a(n) _____
A) diatom
B) dinoflagellate
C) apicomplexan
D) red alga
A
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Myxobacteria lyse bacteria and yeasts by secretion of digestive enzymes. They then use the resulting peptides and amino acids as a source of which of the following?
A. Phosphate B. Iron C. Nitrogen D. All of the choices are correct.
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.
In response to concerns about the safety of genetic engineering, scientists ________
a. were banned from continuing their research b. have relocated in great numbers to more lenient countries c. developed safety guidelines adopted by the National Institute of Health (NIH) d. made speeches assuring the public of the safety of GMOs
Baby bobcats watched as their mother stalked a rabbit and pounced, catching a meal that was shared by all. The next day, two of the young bobcats were seen stalking a field mouse, which easily escaped from the inexperienced hunters. The young bobcats
were learning how to hunt by the process of A) social learning. B) imprinting. C) habituation. D) associative learning.