During translation elongation, one end of the growing polypeptide chain emerges from the ribosome while the other is attached to a tRNA. Which end of the polypeptide emerges?
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The information in most genes produces a functional molecule…
The information in most genes produces a functional molecule by flowing from DNA to RNA to protein. However, some RNAs do not code for a protein and instead are themselves functional molecules. What is the most general term for RNAs that do NOT code for a protein?
What is the function of an aminoacyl-tRNA synthetase?
What is the function of an aminoacyl-tRNA synthetase?
Which is a post-translationalmechanism that can regulate the…
Which is a post-translationalmechanism that can regulate the expression of a gene?
If the protein coding region of a human gene is inserted int…
If the protein coding region of a human gene is inserted into a bacterium with appropriate regulatory sequences to get it transcribed and translated, the polypeptide produced will have the same amino acid sequence as is produced in a human cell. What feature of the genetic code makes this so?
Which of the following indicates the relative rates of trans…
Which of the following indicates the relative rates of transcription of the lac operon for E. coli with access to abundant source(s) of the following of sugar(s): lactose only, glucose only, lactose and glucose. To be clear, transcription rates in answers are as highest > intermediate > lowest.
Watson and Crick proposed a structural model of DNA with nit…
Watson and Crick proposed a structural model of DNA with nitrogenous bases from opposite strands paired at the center of the double helix. Two predictions, 1) that pairing occurs between purine and pyrimidine bases and 2) that pairing occurs between A and T bases and between G and C bases, allowed the model to conform to which two key pieces of data, respectively?
The “one gene one enzyme” hypothesis has evolved significant…
The “one gene one enzyme” hypothesis has evolved significantly over time. Which of the following observations necessitated revisions of the hypothesis?
Consider a single parent bacterium that undergoes 2 rounds o…
Consider a single parent bacterium that undergoes 2 rounds of division to produce 4 progeny bacteria. Because DNA replication is semi-conservative, which of the flowing statements correctly describes the DNA in the progeny cells?
Expression of a gene encoding a miRNA regulates the expressi…
Expression of a gene encoding a miRNA regulates the expression of other genes. Which of the following statements is always true?