Which step in translation initiation is unique to eukaryotes?
A) formation of the preinitiation complex
B) formation of the initiation complex
C) scanning
D) ribosome assembly
E) translocation of the ribosome in the 3? direction
C
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Production of exotoxin A and several proteolytic enzymes and hemolysins are factors that contribute to the pathogenicity of which organism?
a. P. aeruginosa b. Burkholderia cepacia c. Ralstonia pickettii d. Burkholderia mallei
A researcher identifies an abnormality in a protein that causes a particular inherited illness. To develop a treatment, it would be most helpful to know
A) which cells are affected and how to replace the protein's function in them. B) if this type of mutation occurs in all species. C) the other types of molecules that cause or contribute to the disease. D) how the mutation was caused.
The primary building block (monomer) of proteins is
A. an amino acid. B. a nucleotide. C. a fatty acid. D. a glucose molecule. E. a group of four interconnected rings.
For a science fair project, two students decided to repeat the Hershey and Chase experiment, with modifications. They decided to label the nitrogen of the DNA, rather than the phosphate
They reasoned that each nucleotide has only one phosphate and two to five nitrogens. Thus, labeling the nitrogens would provide a stronger signal than labeling the phosphates. Why won't this experiment work? A) There is no radioactive isotope of nitrogen. B) Radioactive nitrogen has a half-life of 100,000 years, and the material would be too dangerous for too long. C) Although there are more nitrogens in a nucleotide, labeled phosphates actually have sixteen extra neutrons; therefore, they are more radioactive. D) Amino acids (and thus proteins) also have nitrogen atoms; thus, the radioactivity would not distinguish between DNA and proteins.