Structures located at the ends of eukaryotic chromosomes are called___ A) recess
ID: 96242 • Letter: S
Question
Structures located at the ends of eukaryotic chromosomes are called___ A) recessive mutations B) permissive mutations C) tolemeres D) centromeres E) telomerases Which of the following is a function of a signal recognition peptide? A) to direct an mRNA molecule into the cisternal space of the ER B) to translocate polypeptides across the ER membrane C) to terminate translation of the messenger RNA D) to bind RNA polymerase to DNA and initiate transcription E) to signal the initiation of transcription Which of the following is the first event to take place in translation in eukaryotes? A) base pairing of activated methionine-tRNA to AUG of the messenger RNA B) the small subunit of the ribosome recognizes and attaches to the mRNA C) covalent bonding between the first two amino acids D) binding of the larger ribosomal subunit to smaller ribosomal subunits E) elongation of the polypeptide shown: A short segment of an mRNA molecule is shown below. The polypeptide it codes for is also 5-AUGGUGCUGAAG methionine-valine-leucine-lysine Assume that a mutation in the DNA occurs so that the fourth base (counting from the 5' end) of the messenger RNA now reads A rather than G. What sequence of amino acids will the mRNA now code for? (You do not need a copy of the genetic code to answer the question.) A) methionine-valine-leucine-lysine B) methionine-leucine-leucine-lysine C) methionine-lysine-leucine-lysine D) methionine-methionine-leucine-lysine E) methionine-valine-methionine-lysine A particular triplet of bases in the coding sequence of DNA is AAA. The anticodon on the tRNA that binds the mRNA codon is A) TTT B) AAA C) UUA D) UUU E) either UAA or TAA, depending on first base wobble. In eukaryotes there are several different types of RNA polymerase. Which type is involved in transcription of mRNA ? A) primase B) RNA polymerase I C) ligase D) RNA polymerase II E) RNA polymerase IIExplanation / Answer
20...Which of the following is a function of a signal peptide
Ans...(B).. To translocate polypeptides across the ER membrane.
21... Which of the following is the first event to take place in translation in eukaryotes.
Ans...(B)...The small subunit of the ribosome recognizes and attaches to the mRNA.
23...A particular triplet of bases in the coding sequence of DNA is AAA.The anticodon on the tRNA that binds the mRNA codon is
Ans...(D)...UUU.
24... In eukaryotes there are several different types of RNA polymerase.Which type is involved in transcription of mRNA.
Ans...(E)...RNA polymerase II