BIO 219 Exam 3 Prep with Questions and Answers

BIO 219 Exam 3 Prep with Questions and Answers Many genes are involved in the catabolic process of digestion. In eukaryotes, is it true that each gene codes for a single enzyme? ANSWER No, not all genes code for enzymes. No, not all genes code for proteins No, some genes code for more than one product. When genes are read in transcription and translation, the code is triplet. Which of the following experiments demonstrated the triplet code? ANSWER Crick and Brenner show that when three nucleotides are added or deleted, mutant bacteriophage can revert to wild-type. When you bite into a large portion of mashed potatoes, the cells of your mouth will activate salivary amylase, which breaks starches into simple sugars. Some people easily increase transcription of this gene, while others can't activate the gene. Which of the following mutations would reduce the transcription of a gene? ANSWER Loss of a Core promoter element, like the TATAA box One of the features of RNA polymerase is that it is inherently non-specific with regard to DNA binding. Which of the following trans-factors determines where RNA polymerase will bind in eukaryotes? ANSWER TFIID In order for trans-factors to bind to DNA, the DNA must be accessible. Which of the following could make the DNA more accessible and more available to trans-factors? ANSWER Acetylation of histones upstream of the gene