Which eon would contain rocks with no fossils?
A. Archean
B. Hadean
C. Proterozoic
D. Phanerozoic
B. Hadean
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The cytoplasmic space in eukaryotic cells is occupied by many diverse membrane-bound structures with specific cellular functions called:
A. flagella. B. organelles. C. receptors. D. cilia. E. chromosomes.
A lack of T cells makes one more vulnerable to intracellular parasites
Indicate whether this statement is true or false.
Which category had the highest amount of endangered species in 2012?
a. amphibians b. insects c. mammals d. plants
A molecular biologist is interested in purifying 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. Add a 6xHis-tag to the C-terminus of the protein B. Amplify the histidine-encoding sequence by PCR and add it to the gene of interest C. Add a series of histidine residues to the N-terminus of the protein D. All of the choices are correct.