Biochemistry
6th Edition
ISBN: 9781305577206
Author: Reginald H. Garrett, Charles M. Grisham
Publisher: Cengage Learning
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Chapter 29, Problem 19P
Figure 29.15 highlights in red the DNA phosphate oxygen atoms. Some of them interact with catabolite activator protein (CAP). What kind of interactions do you suppose predominate, and what kinds of CAP amino acid side chains might be involved in these interactions?
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Within a protein, certain amino acids are positively charged (e.g.,lysine and arginine), some are negatively charged (e.g., glutamateand aspartate), some are polar but uncharged, and some are nonpolar.If you knew that a DNA-binding protein was recognizingthe DNA backbone rather than a base sequence, which aminoacids in the protein would be good candidates for interacting withthe DNA?
The genetic information contained in DNA consists of a linear sequence of coding units known as codons. Each codon consists of three adjacent DNA nucleotides that corresponto a single amino acid in a protien.
The E.coli DNA molecule contains 4.70 x 10^6 base pairs. Determine the number of codons that can be present.
Assuming that the average protein in E.coli consists of a chain of 400 amino acids, calculate the maximum number of protiens that can be coded by an E.coli DNA molecule.
Figure 3 represents one process that occurs during protein synthesis.
amino acid
molecule Q
A UGC C GỤ AC C GAC Ų
(a) Name the process shown.
(b) Identify the molecule labelled Q.
(c) In Figure 3, the first codon is AUG. Give the base sequence of the
complementary DNA base sequence and the missing anticodon.
Table 1 shows the base triplets that code for two amino acids.
Table 1
Amino acid
Encoding base triplet
Aspartic acid
GAC, GAU
Proline
CCA, CCG, CCC, CCU
Aspartic acid and proline are both amino acids.
(d) Describe how two amino acids differ from one another. You may use
a diagram to help your description.
(e) Deletion of the sixth base (G) in the sequence shown in Figure 3 would change
the nature of the protein produced but substitution of the same base would not.
Use the information in Table 1 and your own knowledge to explain why.
Chapter 29 Solutions
Biochemistry
Ch. 29 - Prob. 1PCh. 29 - The Events in Transcription Initiation Describe...Ch. 29 - Substrate Binding by RNA Polymerase RNA polymerase...Ch. 29 - Comparison of Prokaryotic and Eukaryotic...Ch. 29 - Prob. 5PCh. 29 - Prob. 6PCh. 29 - Prob. 7PCh. 29 - Alternative Splicing Possibilities Suppose exon 17...Ch. 29 - Prob. 9PCh. 29 - Prob. 10P
Ch. 29 - Post-transcriptional Modification of Eukaryotic...Ch. 29 - Prob. 12PCh. 29 - Prob. 13PCh. 29 - The Lariat Intermediate in RNA Splicing Draw the...Ch. 29 - Prob. 15PCh. 29 - Prob. 16PCh. 29 - Prob. 17PCh. 29 - Prob. 18PCh. 29 - Figure 29.15 highlights in red the DNA phosphate...Ch. 29 - Chromatin decompaction is a preliminary step in...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biochemistry and related others by exploring similar questions and additional content below.Similar questions
- A gene contains 141 codons. How many nucleotides are present in the gene’s coding sequence? How many amino acids are expected to be present in the polypeptide encoded by this gene?arrow_forwardUsing the Figure below identify: What is the significance of hydrogen bonds in double helix of DN What is a role of base pairs? How genetic information might be stored in the nucleotide sequence of DNA?arrow_forwardHydrolysis of the N-glycosyl bond between deoxyribose and a purine base in DNA creates an apurinic (AP) site. An AP site is more thermodynamically destabilizing to a DNA molecule than is a mismatched base pair. Examine the structure of an AP site. H₂N HN N O™ -O-P-O-CH₂ Guanine H₂N N HN Select the chemical consequences that could contribute to DNA instability at AP sites. H H 1₂0/ H fewer hydrogen bonds between the unpaired pyrimidine base and water disruption of the base-stacking interactions decreased interaction between the mutated DNA strand and histones increased ability of the deoxyribose ring to open without the attachment of the purine base H H Guanosine residue (in DNA) O™ -O-P-O-CH₂ O H H H O Apurinic residue H OH Harrow_forward
- Snake venom phosphodiesterase hydrolyzes nucleotides from the 3' end of any oligonucleotide and cleaves between the 3' hydroxyl of the ribose or deoxyribose and the phosphoryl group of the next nucleotide. It acts on single-stranded DNA or RNA and has no base specificity. Which nucleotide would be released first from the oligonucleotide shown below upon treatment with snake venom phosphodiesterase? choices a. Deoxythymidine 5'-monophosphate b. Deoxyguanosine 3'-monophosphate c. Deoxyguanosine 5'-monophosphate d. Guanosine 5'-monophosphate e. Deoxythymidinearrow_forwardIt is known that double stranded DNA is denatured at low pH. pKa values should allow the determination of whether this is due to perturbation of the hydrogen bonding in A-T and/or G-C base pairs. The table gives values for the pKas of different protonated groups in the nucleobases.Nucleobase Position & pKa A N1, 3.5 G N7, 1.6; N1, 9.2 C N3, 4.2 T N3, 9.7a) Draw the A-T and G-C base pairs. - Label the bases with the one-letter code. – - Number the atoms in the rings and label the atom that attaches to the sugar. - Mark the groups that interact in normal…arrow_forwardThe alpha chain of human hemoglobin has 141 amino acids in a single polypeptide chain. Calculate the minimum number of bases on DNA necessary to code for the alpha chain. Include in your calculation the bases necessary for specifying termination of polypeptide synthesis.arrow_forward
- If an extra nucleotide is inserted in the first exon of the beta globin gene, what effect will it have on the amino acid sequence of the globin polypeptides? Will the globin most likely be fully functional, partly functional, or nonfunctional? Why?arrow_forwardList the pyrimidine bases, the purine bases, and the base-pairing rules for DNA.arrow_forwardState the properties of the WatsonCrick model of DNA in the following categories: a. number of polynucleotide chains b. polarity (running in same direction or opposite directions) c. bases on interior or exterior of molecule d. sugar/phosphate on interior or exterior of molecule e. which bases pair with which f. right- or left-handed helixarrow_forward
- Shown in the following table are several amino acid substitutionsin the a and b chains of human hemoglobin. determine how many of them can occur as a result of a single nucleotide change.arrow_forwardConsider the following protein sequence as an α helix: Leu-Lys-Arg-Ile-Val-Asp-Ile-Leu-Ser-Arg-Leu-Phe-Lys-Val. how many turns does this helix make?arrow_forwardThe first 15 bases of the original coding informational strand of DNA (which continues after what is shown) are 5-ATGAAACCCGGGTTT(...)-3'. Which of the following mutations to this original strand would be silent and which would likely only have a small effect on the coded protein? (Again, only the first 15 bases of the DNA strand are shown, even though they continue on. HINT: To solve this, you might write out the template DNA strand, the mRNA strand that would be made, and the resulting amino acids for the start of the protein.) Mutation #1: 5-ATGAAAGCCCGGGTT(...)-3' Mutation #2: 5-ATGAACCCCGGGTTT(...)-3' Mutation #3: 5-ATGAACCCGGGTTTA(...)-3' Mutation #4: 5-ATGAAGCCCGGGTTT(...)-3' Mutation #5: 5-ATGTAACCCGGGTTT(...)-3'arrow_forward
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