The genetic code was originally deciphered, in part, by experiments in which synthetic polynucleotides with repeating sequences were used as mRNAs to direct protein synthesis in cell-free extracts. Under these conditions, ribosomes could be made to start translation anywhere within the RNA molecules, with no start codon necessary. What peptide would be made by translation from a synthetic mRNA made of the repeating dinucleotide CGCG...?
A. a polymer of alanine: Ala-Ala-Ala...
B. a polymer of arginine: Arg-Arg-Arg...
C. the peptide Met-Arg-Ala-Arg-Ala...
D. a peptide containing alternating arginines and alanines
E. a polymer of arginine plus a polymer of alanine
Ans: D. a peptide containing alternating arginines and alanines
You might also like to view...
Each cone responds primarily to a single color. What kinds of cones do normal humans have?
a. Three cones that perceive red, blue, and yellow light. b. Three cones that perceive red, blue, and green light. c. Three cones that perceive orange, green, and purple light. d. Four cones that perceive red, blue, yellow, and green light. e. All cones respond equally to all colors of the visible light spectrum.
Viruses that infect bacteria are specifically called ________.
A. prions B. satellite viruses C. viroids D. bacteriophages
Four of the five processes listed below are involved
in gene action. Select the exception. a. replication b. transcription c. translation d. polymerization e. polysome activity
When an individual of African descent marries and has children with an individual of European descent, their children often have a mid-shade of skin color, but they could also have a light shade or a dark shade. This can best be described as
A. X-linked inheritance. B. the dominance of the gene for dark skin tone. C. pleiotropic inheritance. D. polygenic inheritance.