Organisms that dominate hydrothermal vents are

a. chemoorganotrophs.
b. photolithotrophs.
c. phototrophs.
d. chemolithotrophs.


Answer: D

Biology & Microbiology

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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.

Biology & Microbiology

The euglenoids are characterized by the disc-shaped cristae of their chloroplasts

Indicate whether the statement is true or false.

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Most organisms live in habitats that provide specific conditions or a(n) ________ that may be very different from regional weather patterns

Fill in the blank(s) with correct word

Biology & Microbiology

The mechanical destruction and/or chemical modification of rock into smaller particles is called

A) leaching. B) mineralization. C) percolation. D) weathering.

Biology & Microbiology