Which is inncorrect concerning ulcers?
A. more than 90% are in the duodenum
B. they may occur when excess acid damages tissue
C. susceptibility is increased by an infection with helicobacter pylori.
D. antibotics can cure an ulcer
E. uclers can occur if bile fails to neutralize the acids chyme that enter the duodenum.
Answer: E. uclers can occur if bile fails to neutralize the acids chyme that enter the duodenum.
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When carbohydrates are oxidized, the C-H bonds of the carbohydrate become C-O bonds of carbon dioxide. Oxidation is defined as a loss of electrons, but carbon does not become positively charged in the process. Why then is this considered carbon oxidation?
A. The shared electrons in C-O bonds spend less time close to the carbon nucleus than shared electrons in C-H bonds. B. Electrons in the C-O bonds are higher energy than the electrons in the C-H bonds. C. C-O bonds in CO2 are double bonds, and C-H bonds are single bonds. D. The phosphate groups of ATP are ionized, and carbons donate those electrons.
Erythropoietin is secreted by the kidneys in response to an increase in blood oxygen levels.
a. true b. false
The dominant herbivore in prairie marshes is the muskrat (Ondatra zibethicus)
Indicate whether the statement is true or false
The physical fragmentation of organic matter into smaller pieces is achieved primarily by invertebrate detritivores
Indicate whether the statement is true or false