Codon usage and even the genetic code itself varies from one organism to the next
Indicate whether the statement is true or false.
Answer: TRUE
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How can two cells in the same complex multicellular organism have different fates?
A. Different genes are activated and repressed in the two cells. B. Different DNA sequences are found in the nuclei of the two cells. C. Different amounts of DNA are found in the nuclei of the two cells. D. Different types of transcription and translation machinery are found in the two cells. E. All of these options are correct.
Which of these stages of translation is most important to the fidelity of protein synthesis?
A. formation of aminoacyl-tRNAs B. initiation of translation at an AUG codon C. translocation of the peptidyl-tRNA from the A site to the P site during elongation D. termination of translation at a STOP codon
In a eukaryotic cell, a gene that is initially transcribed is 1500 nucleotides in length. The mature mRNA for the product is 1200 nucleotides in length. What is the most probable reason for the discrepancy?
A) a mutation that results in a shorter product B) removal of introns C) removal of exons D) mRNA breakage E) both choices A and D
Suppose you decide to alter the rate of a reaction. Which of the following would tend to reverse the enzyme-catalyzed reaction?
a. adding more reactants b. adding more enzyme c. mechanically stirring the contents of a beaker of reactants d. adding more product