A. rRNA is used to transfer amino acids to the ribosome. make up the large ribosomal subunit. make up the subunits of a ribosome. make up the small ribosomal subunit. B. When the full ribosome has bound to mRNA for the first time, the first codon (start codon) of the mRNA is in which site? It varies. P E A

A. rRNA is used to transfer amino acids to the ribosome. make up the large ribosomal subunit. make up the subunits of a ribosome. make up the small ribosomal subunit. B. When the full ribosome has bound to mRNA for the first time, the first codon (start codon) of the mRNA is in which site? It varies. P E A

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Description: A. rRNA is used to transfer amino acids to the ribosome.make up the large ribosomal subunit.make up the subunits of a ribosome.make up the small ribosomal subunit. B. When the full ribosome has bound to mRNA for the first time, the first codon (start

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter9: Molecular Biology

Section: Chapter Questions

Problem 7RQ: Portions of eukaryotic mRNA sequence that are removed during RNA processing are . a. exons b. caps...

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The sequence A is read by RNA polymerase to produce an mRNA that is translated by the ribosome: Choose the sequence that would correspond to that mRNA. A: 3’ – TACGGAACG – 5’ B) 3’ – AUGCCUUGC – 5’ C) 5’ – AUGCCUUGC – 3’ D) 3’ – UACGGAACG – 5’ E) 5’ – UACGGAACG – 3’
The ribosome is needed for translation of mRNA (a) because it has the enzyme for adding amino acids to the 5’ end of a tRNA (b) because the ribosomal RNA contains the codon which determines the sequence of amino acids in a protein (c) because it positions tRNA and mRNA so that correct pairing of codon and anti-codon can occur (d) because it has an enzyme that removes introns from mRNA (e) all of the above
A scientist studies the production of a key digestive enzyme in silk moths. The moths have one gene for this enzyme, and the scientist extracts mRNA transcribed from this gene as well as protein translated from it. The gene has three introns in its sequence. If the researcher compares mRNA from inside the nucleus to mRNA from the ribosomes, what will be found? A. less mRNA in the nucleus B. shorter mRNA in the ribosomes C. identical mRNAs in both places D. mRNA covalently attached to protein in the nucleus
Which of the following BEST describes the characteristics and function of siRNA? A. a short strand of RNA that can complement and inactivate a sequence of mRNA B. a short strand of RNA that can act as a transcription factor to initiate transcription C. a strand of DNA that can bind to and inactivate an mRNA sequence D. a tRNA that is not able to attach to a ribosome and therefore inhibits the process of translation
In a polyribosome, the polypeptides associated with which ribosomes will be the longest? a. Those at the 5′ end of mRNA b. Those at the 3′ end of mRNA c. Those in the middle of mRNA d. All polypeptides will be the same length.
The ribosome is needed for translation of mRNA (a) because it has the enzyme that forms peptide bonds between amino acids (b) because the ribosomal RNA contains the codon which determine the sequence of amino acids in a protein (c) because it contains the enzyme that links the amino acids and tRNA (d) because it has enzyme that removes introns from mRNA (e) all of the above
A nonsense mutation in a gene: A. introduces a premature stop codon into the mRNA B. changes an amino acid in the encoded sequence C. has no effect on the amino acid sequence of the encoded protein D. alters the reading frame of the mRNA
When would a ribosome bind to a promoter sequence? A) It wouldn't. A promoter is a DNA sequence, and ribosomes don't bind to DNA. B) When the ribosome needs to transcribe the gene that that promoter controls. C) When the ribosome is translating the DNA sequence of a gene. D) When there is a start codon (AUG) in the promoter sequence. .
Number the following steps of protein synthesis in order in which they occur, starting with 1 and ending with 9. a. ____ the stop codon is reached, and the polypeptide is released b.____ the small ribosomal subunit finds the start codon, and the large ribosomal subunit joins. c.____ the end of the gene is reached, and the pre-mRNA is released and then edited. d. ____ The transcription factor bonds the promoter. e. ____ the protein is folded and modified to become functional. f. ____ RNA polymerase builds the mRNA transcript. g. ____ mRNA and initiator tRNA bind the small ribosomal subunit. h. ____ new tRNAs are brought into the A site successively, and the peptide chain of the tRNA in the P site is joined to the amino acid of the tRNA in the A site. i. ____ mRNA exits the nucleus via a nuclear pore.
Which of the following is true about the three major classes of RNAs in the cell: mRNAs, tRNAs, and rRNAs? A. mRNAs encode polypeptide chains. B. tRNAs are structural components of the ribosome. C. rRNAs are adapter molecules that translate the information on an mRNA into a polypeptide sequence. D. mRNAs can also encode tRNAs and rRNAs.
Number the following steps of protein synthesis in the order in which they occur, starting with 1 and ending with 9.a. _____ The stop codon is reached, and the polypeptide is released.b. _____ The small ribosomal subunit finds the start codon, and the large ribosomal subunit joins.c. _____ The end of the gene is reached, and the pre-mRNA is released and then edited.d. _____ The transcription factor binds the promoter.e. _____ The protein is folded and modified to become functional.f. _____ RNA polymerase builds the mRNA transcript.g. _____ mRNA and initiator tRNA bind the small ribosomal subunit.h. _____ New tRNA molecules are brought into the A site successively, and the peptide chain of the tRNA in the P site is joined to the amino acid of the tRNA in the A site.i. _____ mRNA exits the nucleus via a nuclear pore.
(a) Write the complementary base sequence for the matching strand in the DNA section shown below:. 5’ – A T G T T A C T A G T C – 3’ (b) The following section of DNA is used to build an mRNA for a protein: 3′—AAG—CTT—CTC—5′. What is the corresponding mRNA sequence?