Regeneration of oxaloacetate is essential for the citric acid cycle to be cyclical
Indicate whether the statement is true or false.
Answer: TRUE
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Which of the following is an exception to the central dogma?
A) the discovery of RNA viruses that synthesize DNA using reverse transcriptase B) the discovery that the Archaea and Bacteria are more distantly related than are Archaea and Eukarya C) the discovery of ribozymes D) the discovery of DNA as the unit of genetic inheritance
One function of HCl secreted in the stomach is to convert pepsinogen into the active enzyme pepsin. Why don't stomach cells simply secrete pepsin instead?
A. Adequate amounts of pepsin are already manufactured by the pancreas. B. Only the pepsinogen version is able to stabilize fat-water emulsions. C. Pepsin is denatured and rendered inactive in solutions with low pH. D. If cells produced active pepsin, they would digest their own cellular proteins.
The melting of ice is an example of a(n) ________ process
Fill in the blank with correct word.
Which of the following are formed during the dissociation of carbonic acid as it occures in the tissue capillaries.
A) Water B) Bicarbonate ions C) Hydrogen ions D) Cardon dioxide