Which eon would contain rocks with no fossils?  

A.  Archean
B.  Hadean
C.  Proterozoic
D.  Phanerozoic


B.  Hadean

Biology & Microbiology

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A lack of T cells makes one more vulnerable to intracellular parasites

Indicate whether this statement is true or false.

Biology & Microbiology

Which category had the highest amount of endangered species in 2012?

a. amphibians b. insects c. mammals d. plants

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology