The inferior mesenteric artery arises from the abdominal aorta immediately posterior to which of the following organs?
A. Fisrt part of the duodenum
B. Head of the pancreas
C. Third part of the duodenum
D. Second part of the duodenum
E. Body of pancreas
Ans: C. Third part of the duodenum
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How would cellulose-degrading bacteria in the rumen (stomachs) of a cow benefit the animal?
A. The bacteria would produce, secrete, and incorporate organic molecules as they obtain energy from the cellulose in grass and replicate. The cow could then digest both the secreted organic molecules AND the bacteria that synthesized them. B. The bacteria would produce sugars as they digested the cellulose. These sugars would be given off to the cow as a symbiotic relationship in exchange for the protected location of the stomachs of the cow for the bacteria to grow and replicate in. C. They wouldn't benefit the animal-they would replicate and cause disease in the animal, leading to its death. D. They wouldn't benefit the animal-only the bacteria within the animal. This is why cows must have food sources other than grass in order to survive.
Although most biologists do not consider viruses to be alive, viruses do share some characteristics with living things. Which of the following is the requirement for life that viruses lack?
A) The ability to reproduce on their own B) The ability to move C) Having genetic material D) Having highly ordered structure
This bacterium derives nutrition by digesting human intestinal contents. Thus, this bacterium is an _____
A) aerobic chemoheterotroph B) aerobic chemoautotroph C) anaerobic chemoheterotroph D) anaerobic chemoautotroph
The bed of capillaries in a vertebrate kidney where water, urea, and salts are filtered out of the blood is the __________.
a. Bowman's capsule b. collecting duct c. glomerulus d. loop of Henle e. proximal convoluted tubule