Modern cells are thought to have arisen from
a. protocells.
b. pre-cells.
c. gas and dust clouds.
d. prokaryotic cells that predated protocells.
e. prokaryotic cells that predated pre-cells.
A
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____ can simply be referred to as change over time
Help with this statement please? Thanks.
Using restriction enzymes, a eukaryotic gene is cut, ligated into a bacterial plasmid, and introduced into a strain of E. coli. To better the odds of getting expression of the eukaryotic gene in this system, you need to make certain that
A) the gene has a eukaryotic promoter for transcription. B) the plasmid has a prokaryotic promoter for transcription. C) the gene and the plasmid were cut with different restriction enzymes. D) the gene product is toxic to the bacterial cell. E) mRNA is used for ligation directly into the vector.
Which organs play a role in mechanical digestion?
A) small intestine B) liver C) mouth D) large intestine E) stomach
Please match the viral diagnostic method to its description. Used to cultivate viruses and observe cytopathic effects on host cells
A) PCR B) Immunological testing C) Electron microscopy D) Cell and tissue culture techniques E) Observation of the patient