Organisms that dominate hydrothermal vents are
a. chemoorganotrophs.
b. photolithotrophs.
c. phototrophs.
d. chemolithotrophs.
Answer: D
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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.
The euglenoids are characterized by the disc-shaped cristae of their chloroplasts
Indicate whether the statement is true or false.
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
The mechanical destruction and/or chemical modification of rock into smaller particles is called
A) leaching. B) mineralization. C) percolation. D) weathering.