One key reason why viruses are not considered living organisms is

viruses do not contain genetic information.
viruses do not reproduce on their own.
viruses are all smaller than the smallest known cells.
viruses do not contain a nucleus.
viruses can be frozen and still survive


viruses do not reproduce on their own

Biology & Microbiology

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All of the following are algae except:

A) desmids. B) diatoms. C) dinoflagellates. D) sporozoa.

Biology & Microbiology

The above map of ________ exemplifies the core-periphery nature of today's world system

A) gross national income per capita B) gross domestic product C) total national debt D) agricultural cover E) percent of workforce in the primary sector

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

What is the estimated annual value of ecosystem services?

A) $1 billion B) $33 trillion C) $33 billion D) $1 trillion

Biology & Microbiology