Which of the following is not a pinniped:
1.seal
2.sea lion
3.walrus
4.sea otter
4
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Contrary to popular belief, stress is not usually the primary cause of ulcers, and many patients with ulcers do not over-produce acid. What Nobel prize-winning discovery demonstrated a previously unknown cause of ulcers?
A. the existence of a bacterial infection in the stomachs of most patients with ulcers B. genetically predetermined weakness in the walls of the intestinal tract C. the eroding effect of certain spicy foods on the lining of the esophagus D. greater acid concentrations in the stomach, lower esophagus, and duodenum
The pressure exerted on the inner walls of the arteries when the heart relaxes between beats is the ____ pressure
a. systolic b. diastolic c. barometric d. residual
Why is acetogenesis from H2 and CO2 more favored than methanogenesis in termites?
a. Unlike methanogens, acetogens are able to use other substrates, such as sugars, as electron donors for energy metabolism. b. Unlike acetogens, methanogens are able to use other substrates, such as methyl groups, as electron donors for energy metabolism. c. Termite acetogens can better colonize the H2-rich termite gut center, whereas methanogens are restrictedto the wall. d. both a and c
If two sister species on the phylogenetic tree above differ from the other two in a single character state (say dark or light fur), denote any possible evolutionary changes by placing an arrow—or arrows—on the tree below
Be sure to label the arrows as a loss or gain What will be an ideal response?