Atoms of a single element that possess different numbers of neutrons are called:
A. ions.
B. isotopes.
C. polymers.
D. monomers.
E. isomers.
Answer: B
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You are a researcher who wants to inactivate the gene in mosquitoes that allows them to host the malarial parasite. What biotechnology tool would be best suited for this task?
A) polymerase chain reaction (PCR) B) cloning C) CRISPR D) creating a gene library E) chopping DNA with restriction enzymes
The unexpressed regions of split genes are called
A. exons. B. introns. C. endons. D. codons.
Cholera symptoms are
A. hypotension, tachycardia, and shock. B. copious watery diarrhea. C. acidosis, sunken eyes, and thirst. D. loss of blood volume. E. All of the choices are correct.
The majority of phyla from domain Bacteria were discovered by
a. sequencing isolates cultivated in laboratory media. b. sequencing DNA extracted directly from environmental samples. c. using enrichment media. d. transmission electron microscopy.