Concept explainers
(a)
Interpretation: The validation of the given statement that the active site of a ribosome is located in its smaller subunit has to be stated.
Concept introduction: RNA combines with specific proteins and generates ribosomes. Ribosomes are the physical site for protein synthesis. Ribosomes have no informational function.
(b)
Interpretation: The validation of the given statement that a ribosome is a tRNA–protein complex has to be stated.
Concept introduction: RNA combines with specific proteins and generates ribosomes. Ribosomes are the physical site for protein synthesis. Ribosomes have no informational function.
(c)
Interpretation: The validation of the given statement that ribosome subunits are approximately 75% protein and 25% RNA has to be stated.
Concept introduction: RNA combines with specific proteins and generates ribosomes. Ribosomes are the physical site for protein synthesis. Ribosomes have no informational function.
(d)
Interpretation: The validation of the given statement that the human cells contain from 10 to 20 ribosomes has to be stated.
Concept introduction: RNA combines with specific proteins and generates ribosomes. Ribosomes are the physical site for protein synthesis. Ribosomes have no informational function.
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EBK GENERAL, ORGANIC, AND BIOLOGICAL CH
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- Which of the following is FALSE about spliceosomes? a. In eukaryotic cells are present in the nucleus. b. Are about the size of a ribosomal subunit. c. In bacteria, are present in the cytoplasm. d. Contain RNA and protein.arrow_forwardEach of the following statements about protein synthesis is false.Correct each to make a true statement. a. In a gene, each nucleotide specifies one amino acid in a protein sequence. b. A transcription factor must bind to the promoter region of a gene before the enzyme DNA synthetase is able to bind and begin transcription. c. The enzyme RNA polymerase builds a strand of transfer RNA, whose codons are complementary to DNA’s triplets. d. Proteins destined for secretion from the cell enter the nucleus after translation, to be folded and modified. e. During translation, amino acids are delivered by the messenger RNA transcriparrow_forwardWhich of the following proteins would you expect to be translated by a ribosome associated with the rough endoplasmic reticulum? A. A potassium channel that localizes to the plasma membrane B. Pyruvate kinase (a protein involved in glycolysis) C. A component of RNA polymerase II (a.k.a. RNA Polymerase 2) D. A component of DNA polymerasearrow_forward
- The anticodons are located in a.tRNA. b.rRNA. c.mRNA. d.ribosomes. e.endoplasmic reticulum.arrow_forwardRibosomes in the cytoplasm (cytosol) capture mRNA that can be translated into an enzyme (in this case a protease) to the lysosome. a) Describe what happens from the time the enzyme (protease) begins to form in the cytoplasm until it end up in the lysosome and explain how the enzyme is transported to the lysosome.arrow_forwardChoose the correct answer: 1. which statement is true: Select one: a. Ribosome is consists of proteins and DNA b. The E.coli ribosome has a large subunit (50S, has the 23S and a 5S RNA) and a small subunit (30S, has a 16S RNA). c.•The E.coli ribosome has a large subunit (40S, has the 23S and a 5S RNA) and a small subunit (20S, has a 16S RNA). d. The E.coli ribosome has a large subunit (60S, has the 23S and a 5S RNA) and a small subunit (40S, has a 16S RNA). 2. Which of the following are not the components of RNA? Select one: a. Adenine b. Guanine c. Thymine d. Cytosine 3. Which is the first amino group entering into urea cycle? Select one: a. Argininosuccinate b. Ornithine c. Cituilline d. carbamoyl phosphate 4. The breakdown of glycogen to form glucose occurs Select one: a. both liver and muscle b. in the brain by phosphorolysis. c. in the kidney by phosphorolysis. d. none is correct 5.The precursor to glycogen in the glycogen synthase reaction is Select one:…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_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_forward1. The correct folding of proteins is necessary to maintain healthy cells and tissues. Unfolded proteins are responsible for such neurodegenerative disorders as Alzheimer’s, Huntington’s, and Creutzfeld-Jacob disease (the specific faulty protein is different for each disease). What is the ultimate fate of these disease-causing, unfolded proteins? a. They form structured filaments. b. They are degraded. c. They bind a different target protein. d. They form protein aggregates. 2. Proteins that are always present in the cell are encoded in genes that are __________ expressed, whereas proteins that are present only in response to a stimulus are encoded by genes that are ______________ expressed. a. timely, extemporaneously b. inducibly, constitutively c. extemporaneously, timely d. constitutively, induciblyarrow_forward
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