Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 12, Problem 6TY
Summary Introduction
Introduction: The ribosomes are small specialized minute particles that serve as a protein synthesis sites. The ribosomes are distributed all over the cells though their highest concentration can be found on rough endoplasmic reticulum. They have two subunits, a large and a small which are united to form a protein translation unit along with mRNA and helps in the attachment of specific tRNA molecules during peptide synthesis.
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The anticodons are located in a.tRNA. b.rRNA. c.mRNA. d.ribosomes. e.endoplasmic reticulum.
All of the following regarding ribosomes are true EXCEPT:
A. Ribosomes are comprised of protein and RNA.
B. Ribosomes coordinate with initiation and elongation factors to regulate translation.
C. Ribosomes bind transcripts in their promoters.
D. Prokaryotic ribosomes are comprised of a large and a small subunit.
E. Ribosomes in eukaryotic cells bind to complete transcripts.
Which of the following is true of ribosome rescue? (C & E wrong)
A. The process produces a protein that is tagged for degradation.
B. Proteases enter the A-site of the ribosome to degrade the C-terminus of the synthesized peptide.
C. A partially translated mRNA becomes fully degraded before it can be translated further.
D. No protein is produced in the process.
E. Stalled ribosomes are released in the absence of a stop codon.
Chapter 12 Solutions
Biology
Ch. 12.1 - What disease would result if a person inherited...Ch. 12.1 - Prob. 2CCCh. 12.1 - What is the direction of flow of genetic...Ch. 12.2 - Core Skill: Connections Look back at the role of...Ch. 12.3 - Prob. 1CCCh. 12.4 - Prob. 1CCCh. 12.4 - Prob. 1EQCh. 12.4 - Prob. 2EQCh. 12.4 - Prob. 3EQCh. 12.5 - Core Skill: Connections Look back at Figure 6.3,...
Ch. 12.5 - Prob. 2CSCh. 12.6 - Prob. 1CCCh. 12 - Which of the following best represents the central...Ch. 12 - A mutation prevents a gene from being transcribed...Ch. 12 - Prob. 3TYCh. 12 - Prob. 4TYCh. 12 - If a eukaryotic mRNA failed to have a cap attached...Ch. 12 - Prob. 6TYCh. 12 - Prob. 7TYCh. 12 - During the initiation of translation, the first...Ch. 12 - Prob. 9TYCh. 12 - Prob. 10TYCh. 12 - Prob. 1CQCh. 12 - Prob. 2CQCh. 12 - Prob. 3CQCh. 12 - Prob. 1COQCh. 12 - Prob. 2COQ
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- For each of the following, identify the type of RNA involved (mRNA, rRNA, or tRNA). a. Transports the correct amino acid to the ribosome, using the information encoded in the mRNA. b. Is a major component of ribosomes. c. Specifies the order of amino acids in a protein, using a series of three-base codons, where different amino acids are specified by particular codons. d. Contains a three-base anticodon that pairs with a complementary codon revealed in the mRNA. e. Assists in making the bonds that link amino acids together to make a protein.arrow_forwardWhich 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 translationarrow_forwardEach ribosomal subunit is composed of a. multiple proteins. c. tRNA. b. rRNA. d. both a and b.arrow_forward
- Which of the following statements about the nucleolus is not true? a. The nucleolus is a membrane-bound structure. b. rRNA genes are transcribed in the nucleolus. c. Ribosomal subunits are synthesized in the nucleolus. d. rRNA molecules are chemically modified in the nucleolus.arrow_forwardThe “A” site in the ribosome refers to the: A. binding site for charged t-RNA molecules during protein synthesis B. Site that allows for tRNAs to exit C. a site that holds the tRNA which is linked to the growing polypeptide chain D. none of these answeresarrow_forwardThe protein component of the ribosome is thought to provide what function? a. Structural stability. b. Catalytic function. c. Nucleic acid binding/recognition. d. None of the above.arrow_forward
- Indicate the phase of protein synthesis during which each of the following processes occurs: a. A ribosomal subunit binds to a messenger RNA. b. The polypeptide is actually synthesized. c. The ribosome moves along the codon sequence. d. The ribosome dissociates into its subunits.arrow_forwardWhich of the following describes the interactions between a codon and an anticodon? A. A codon and an anticodon become covalently bonded together due to the activity of the ribosome. B. A codon and anticodon do not come into direct contact because codons are in the nucleus but anticodons are in the cytoplasm. C. A codon and anticodon are attracted to each other due to hydrogen bonding. D. A codon and an anticodon are linked together by an amino acid. ..arrow_forwardI'm a tRNA that is found in the E site of a ribosome. From this, you KNOW a. I'm participating in the formation of peptide bonds b. I'm going to go through the P site next and lengthen the chain c. I have no amino acid and have already passed through the A and P sites d. I'm going to cause the ribosome to dissociatearrow_forward
- One of the concerns with GMO is the toxicity of product by GMO when consumed by humans. Suppose that the product is to block the 16S rRNA in the proakryotic small subunit, do you think it will have a high level of toxicity? Why? A. Yes, because the genetic code is universal. B. No, because the genetic code is NEARLY universal. C. No, because human ribosomes are different.arrow_forwardWhich type of RNA carries activated amino acids to the ribosome for assembly into proteins? A. mRNA. B. sRNA. C. tRNA. D. rRNA. Strands in the stem of stem-loop RNA structures are parallel. True Falsein bold is my answer but im not sure the second one i need help with it tooarrow_forwardA single RNA molecule with many gene sequences… a. is only found in eukaryotes b. is not translated c. will not have ribosome binding sites d. is polycistronic RNA e. is a polysomearrow_forward
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