CAMPBELL BIOLOGY V1 PKG >C<
15th Edition
ISBN: 9781269881555
Author: Reece
Publisher: PEARSON C
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Chapter 17.3, Problem 3CC
Summary Introduction
To determine: The effect on the cells that are treated with an agent which caused the removal of cap from messenger RNAs (mRNAs).
Concept introduction:
After transcription, pre-mRNA is synthesized and further modified before translation in the cytoplasm. This is called the RNA processing and it includes the modification of mRNA ends and RNA splicing. A modified guanine (7-methyl guanine) group is added to the 5′ end of the mRNA chain with the help of the capping enzymes. This is known as the 5′ cap. At the 3′ end of the eukaryotic mRNA chain, adenine groups (poly-A tail) are added by poly (A) polymerase enzyme. This is known as the polyadenylation.
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WHAT IF? Suppose the mRNA being degraded in Figure18.14 coded for a protein that promotes cell division ina multicellular organism. What would happen if a mutation disabled the gene for the miRNA that triggers thisdegradation?
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A.)Search in human genome if any examples of mRNA translated from 2 different sites?and give examples?
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WHAT IF? In eukaryotic cells, mRNAs have been foundto have a circular arrangement in which proteins holdthe poly-A tail near the 5¿ cap. How might this increasetranslation efficiency?
Chapter 17 Solutions
CAMPBELL BIOLOGY V1 PKG >C<
Ch. 17.1 - Prob. 1CCCh. 17.1 - What polypeptide product would you expect from a...Ch. 17.1 - Prob. 3CCCh. 17.1 - Prob. 4CCCh. 17.2 - MAKE CONNECTIONS In a research artide about...Ch. 17.2 - What enables RNA polymerase to start transcribing...Ch. 17.2 - Prob. 3CCCh. 17.3 - Prob. 1CCCh. 17.3 - How is RNA splicing similar to how you would watch...Ch. 17.3 - Prob. 3CC
Ch. 17.4 - What two processes ensure that the correct amino...Ch. 17.4 - Prob. 2CCCh. 17.4 - Prob. 3CCCh. 17.4 - Prob. 4CCCh. 17.4 - WH AT IF? In eukaryotic cells, mRNAs have been...Ch. 17.5 - What happens when one nucleotide pair is lost from...Ch. 17.5 - MAKE CONNECTIONS Individuals heterozygous for the...Ch. 17.5 - WHAT IF? DRAW IT The template strand of a gene...Ch. 17 - Describe the process of gene expression, by which...Ch. 17 - What are the similarities and differences in the...Ch. 17 - What function do the 5' cap and the poly-A tail...Ch. 17 - Prob. 17.4CRCh. 17 - What will be the results of chemically modifying...Ch. 17 - In eukaryotic cells, transcription cannot begin...Ch. 17 - Which of the following is not true of a codon? (A)...Ch. 17 - The anticodon of a particular tRNA molecule is (A)...Ch. 17 - Which of the following is not true of RNA...Ch. 17 - Which component is not directly involved in...Ch. 17 - Using Figure 17.6, identify a 5' 3' sequence of...Ch. 17 - Prob. 7TYUCh. 17 - Would the coupling of the processes shown in...Ch. 17 - Prob. 9TYUCh. 17 - Prob. 10TYUCh. 17 - Prob. 11TYUCh. 17 - Prob. 12TYUCh. 17 - Prob. 13TYU
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- WHAT IF? Imagine a protein that functions in the ERbut requires modification in the Golgi apparatus beforeit can achieve that function. Describe the protein’s paththrough the cell, starting with the mRNA molecule thatspecifies the protein.arrow_forwardDiscuss Concepts Why do you suppose cells evolved internal response mechanisms using molecules that bind GTP instead of ATP?arrow_forwardWHAT IF? A certain mutation in E. coli changes the lacoperator so that the active repressor cannot bind. Howwould this affect the cell’s production of β-galactosidase?arrow_forward
- Q. Describe the different methods the cells use to restrict proteins to specific regions of the plasma membranearrow_forwardWHAT IF? In Figure 18.17b, the lower cell is synthesizingsignaling molecules, whereas the upper cell is expressingreceptors for these molecules. In terms of gene regulationand cytoplasmic determinants, explain how these cellscame to synthesize different molecules.arrow_forwardWhat is a KDEL motif? A The KDEL motif functions as a stop-transfer sequence in Type I membrane proteins. B The KDEL motif is a four amino acid sequence (Lysine-Aspartic acid-Glutamic acid-Leucine) that functions as an ER retention signal to keep proteins localized to the ER. C The KDEL motif is a sequence of four amino acids that targets proteins to the nucleus. D The KDEL motif is a sequence of four amino acids with positive charges that functions to bind RNA.arrow_forward
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