Starchy foods in our diets, such as rice and potatoes, consist of many glucose molecules covalently bonded together to form
A. a simple sugar.
B. a complex carbohydrate.
C. a fatty acid chain.
D. a triglyceride.
E. a protein.
B. a complex carbohydrate.
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Linnaeus sorted animals into groups based on body plans. Today, these groupings are called:
A. families. B. branches on the phylogenetic tree. C. phyla.
Why is it that the tongue and cheek epithelium doesn't provide a sufficient anaerobic environment for plaque anaerobes to grow, but the surface of teeth might?
A. The epithelium is supplied with oxygen by capillary beds. This makes it a relatively aerobic environment and hostile to anaerobes. B. The tooth enamel is supplied with oxygen by capillary beds. This makes it a relatively anaerobic environment and hostile to aerobes. C. The surface of the tongue and cheek are constantly scraped by the action of consuming food. Layers of bacterial growth that might help to supply an anaerobic environment are scraped away, exposing lower levels to oxygen-rich air. D. The surface of teeth (especially the molars) have many pits and crevices that can serve as 'pockets' for layers of bacteria to grow in. Once the layers get deep enough, the bottom portions are anaerobic. This isn't possible on the very smooth surface of the tongue and cheek epithelium.
Without data from the base composition studies of Chargaff, what might Watson and Crickâs modeling studies have erroneously concluded?
A. Bases could pair with themselves (e.g. A with A, C with C). B. Any purine could pair with any purine. C. Any pyrimidine could pair with any pyrimidine. D. Any purine could pair with any purine and any pyrimidine could pair with any pyrimidine. E. Any purine could pair with any pyrimidine.
Four of the five answers listed below are actions mediated by the sympathetic nervous system. Select
the exception. a. pulse increases b. blood glucose levels drop c. metabolism increases d. digestion slows down e. pupils of the eye dilate