Why did scientists originally hypothesize that proteolytic enzymes such as pepsin and trypsin are secreted in inactive form?
A) These proteolytic enzymes, in active form, would digest the very tissues that synthesize them.
B) They identified the hormone that activates pepsin and trypsin.
C) The stomach is too acidic to maintain these enzymes in their active form.
D) Pepsin and trypsin have never been isolated in their fully activated form.
Answer: A
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While a eukaryotic pre-mRNA is still being synthesized it is modified on its 5' end when
a. exon shuffling mixes mRNA pieces. b. enzymes recognize a polyadenylation signal in the trailing RNA sequence. c. the RNA introns are cut out by the spliceosome. d. an enzyme adds a guanine-containing cap. e. the RNA exons are spliced together.
The molecule below is a(n)
A. amino acid.
B. carbohydrate.
C. lipid.
D. nucleic acid.
The class Insecta
a. Has more species than any other group of animals b. Is of major medical importance to humans c. Is of major economic importance to humans d. Are critical in ecology that the loss of all insects would cause a major disruption in nature e. All of the choices are correct
A Coulter counter is used to obtain pure cultures.
Answer the following statement true (T) or false (F)