In animal cells, microtubules grow from
A. the outer membrane of the nuclear envelope.
B. dimerization centers located throughout the cytosol.
C. the tips of the chromosomes.
D. the plasma membrane.
E. centrosomes containing centrioles.
Answer: E
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A molecular biologist is interested in purify a recombinant protein by His-tagging, but the protein and vector both lack histidine residues. In this case, the molecular biologist could use which of the following technique(s) to achieve purification?
A. Amplify the histidine-encoding sequence by PCR and add it to the gene of interest. B. Add a 6xHis-tag to the C-terminus of the protein. C. Add a series of histidine residues to the N-terminus of the protein. D. All of the choices are correct.
Under anaerobic conditions, the end-product of glycolysis is converted to
What will be an ideal response?
Natural selection can increase the frequency of deleterious alleles
a. true b. false
Monoclonal antibodies are obtained from
A. human serum. B. animal serum. C. hybridomas. D. human B cells in culture. E. both human and animal serum.