Which of the following is/are TRUE regarding ghrelin?
a. ghrelin stimulates acid secretion
b. removal of ghrelin secreting cells leads to appetite reduction
c. ghrelin is a peptide hormone
d. all of the above
e. a and b
Answer: d. all of the above
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DNA replication is started with a(n) ________, which, in most cases, in vivo is a short stretch of ________
A) promoter / DNA B) mRNA / RNA C) primer / RNA D) ribosome-binding sequence / DNA
Which of the following causes an exotic species to become an invasive species?
a. An exotic species multiplies and changes the ecological conditions of the environment. b. An exotic species has characteristics that are like the environment’s endemic species. c. An exotic species is transported intentionally by humans into a new environment. d. An exotic species competes for resources with an environment’s endemic species.
The primary function of DNA ligase is to
a. cut the two strands of the DNA molecule prior to replication. b. attach free nucleotides to the growing chain. c. remove bases that might be inserted incorrectly. d. seal new short stretches of nucleotides into one continuous strand. e. fragment old DNA that is no longer of use to the cell.
T-independent antigens
A) may be polysaccharides or proteins, and are not able to bind multiple B cell receptors on a given B cell. B) are usually polysaccharides and able to bind multiple B cell receptors on a given B cell. C) are able to bind multiple B cell receptors on a given B cell. D) are usually proteins. E) are usually polysaccharides.