Chapter 17 Homework
A particular triplet of bases in the template strand of DNA is 5-AGT-3. What would be the corresponding codon for the mRNA that is transcribed?
3-UCA-5
What is the function of RNA polymerase?
It unwinds the double helix and adds nucleotides to a growing strand of RNA
Which one of the following is true of tRNAs?
None of the listed answers is correct
In eukaryotes, there are several different types of RNA polymerase. Which type is involved in transcription of mRNA for a globin protein?
RNA polymerase II
In bacteria, there are 61 mRNA codons that specify an amino acid, but only 45 tRNAs. Which of the following statements explains this fact?
The rules for base pairing between the third base of a codon and tRNA are flexible
A particular triplet of bases in the coding strand of DNA is AAA. The anticodon on the tRNA that binds this mRNA codon is _____
UUU
Which of the following DNA mutations is most likely to damage the protein it specifies?
Which of the following DNA mutations is most likely to damage the protein it specifies?
Which of the following statements is the most current description of a gene?
a DNA sequence that is expressed to form a functional product: either RNA or polypeptide
What is a ribozyme?
a biological catalyst made of RNA
Which of the following types of mutation, resulting in an error in the mRNA just after the AUG start of translation, is likely to have the most serious effect on the polypeptide product?
a deletion of two nucleotides
The most commonly occurring mutation in people with cystic fibrosis is a deletion of a single codon. What is the result of this type of mutation?
a polypeptide missing an amino acid
The flow of information in a cell proceeds in what sequence?
from DNA to RNA to protein
After an RNA molecule is transcribed from a eukaryotic gene, what are removed and what are spliced together to produce an mRNA molecule with a continuous coding sequence?
introns ... exons
Which of the following processes is the first event to take place in translation in eukaryotes?
the small subunit of the ribosome recognizes and attaches to the 5 cap of mRNA
A codon consists of _____ bases and specifies which _____ will be inserted into the polypeptide chain.
three ... amino acid