During the termination stage
a. a STOP codon enters the ribosome.
b. release factors bind the ribosome.
c. mRNA detaches from the ribosome and the
polypeptide chain.
d. ribosomal subunits separate.
e. all of these occur
E
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The thin delicate membrane just attached to the cytoplasm
a. Ectoplasm b. Endoplasm c. Tonoplast d. Protoplasm
Soon after the introduction of antibiotics, resistant strains of bacteria that could grow in the presence of particular antibiotics began to evolve. Researchers develop new antibiotics, only to see resistant bacterial strains evolve within a few years. Which of the following explains why resistant strains of bacteria can evolve so quickly?
A. Bacteria have a short generation time. B. Bacteria can transfer plasmids containing resistance genes via conjugation. C. Horizontal gene transfer. D. Bacteria have a short generation time and can transfer plasmids containing resistance genes via conjugation. E. Bacteria have a short generation time and can transfer plasmids containing resistance genes by horizontal gene transfer mechanisms such as conjugation.
The process by which two interacting species act as agents of natural selection on one another is called
A) parasitism. B) mutualism. C) coevolution D) symbiosis. E) mimicry.
Cyanide is a poison which prevents the last carrier in the electron transport chain (cytochrome C oxidase) from transferring the electron to the final electron acceptor. Which of the following would not be a consequence of exposure to this poison?
A) ADP would no longer be recharged to form ATP. B) Glycolysis, the intermediate reaction, and the Krebs cycle would stop as the cell would run out of the necessary oxidized coenzymes NAD+ and FAD. C) Movement of electrons through the chain would stop. D) Carbon dioxide would continue to be generated. E) Protons would no longer be pumped outside the membrane.