A gene that contains introns can be made shorter (but remain functional) for genetic engineering purposes by using _____
A) a restriction enzyme (endonuclease) to cut the gene into shorter pieces
B) reverse transcriptase to reconstruct the gene from its mRNA
C) DNA polymerase to reconstruct the gene from its polypeptide product
D) DNA ligase to put together fragments of the DNA that code for a particular polypeptide
B
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When RNA-dependent RNA polymerase is synthesizing mRNA it is functioning as a ________.
A. helicase B. replicase C. transcriptase D. ligase
In the process of aerobic metabolism, carbon containing molecules are broken down and the energy
from the electrons is used for what purpose?
a. to directly supply the energy needs of an organism b. to generate a proton gradient c. to alter enzyme structure d. to heat the organism in a cold environment e. to heat stored fat
Ions in plasma help to
a. control blood pressure. b. fight infections. c. maintain volume and pH of extracellular fluid. d. clot blood. e. digest nutrients.
Charles Darwin wrote that members of the phylum ________ are particularly important for agriculture because they mix and aerate soil
A) Annelida B) Cnidaria C) Nematoda D) Arthropoda E) Platyhelminthes