a.
To determine:
Whether the different genes for transfer RNA in human beings possess different types of functions.
Introduction:
The transfer RNA (Ribonucleic acid) possess anticodon region which binds with the codon region of messenger RNA and help in the process of translation. The human genome contains an average of about 500 genes for the transfer RNA.
b.
To determine:
The reason due to which the genome of human beings undergo so many modifications and evolutions to house an ample number of transfer RNA genes.
Introduction:
Numerous transfer RNA are housed by the human genome. All the transfer RNA help in the process of translation by carrying various amino acids from the amino acid pool.
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Chapter 8 Solutions
Genetics: From Genes to Genomes
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- A molecular geneticist hopes to find a Gene in human liver cell that codes for an important blood-clotting protein,he knows that the nucleotide sequence of a small part of the Gene is GTGGACTGACA.briefly explain how to obtain genearrow_forwardThe genetic code is thought to have evolved to maximize genetic stability by minimizing the effect on protein function of most substitution mutations (single-base changes). We will use the six arginine codons to test this idea. Consider all of the substitutions that could affect all of the six arginine codons.(a) How many total mutations are possible?(b) How many of these mutations are “silent,” in the sense that the mutantcodon is changed to another Arg codon?(c) How many of these mutations are conservative, in the sense that an Argcodon is changed to a functionally similar Lys codon?arrow_forwardDNA from a eukaryotic gene was isolated, denatured, and hybridized to the mRNA transcribed from the gene; the hybridized structure was then observed with an electron microscope. The adjoining diagram shows the structure that was observed. a. Identify and label the exons and introns in this hybridized structure.arrow_forward
- In your own wordsarrow_forwardConsider the following DNA sequence, which codes for a short polypeptide: 5'-ATGGGCTTAGCGTAGGTTAGT-3' Determine the mRNA transcript of this sequence. You have to write these sequences from the 5' end to the 3' end and indicate those ends as shown in the original sequence in order to get the full mark. How many amino acids will make up this polypeptide? Determine the first four anticodons that will be used in order to translate this sequence.arrow_forward28. a. Can a tRNA exist that has the anticodon sequence 5' IAA? If so, which amino acid would it carry? b. Answer the same question for the anticodon sequence 5' xm³s²UAA. 29. For parts (a) and (b) of Problem 28, consider the DNA sequences of the genes encoding the tRNAs. (Assume both tRNAs exist even if that is not true.) What is the sequence of the RNA-like strand of each tRNA gene that corresponds to the tRNA's anticodon? What is the sequence of the template strand of each gene for these same three nucleotides? Be sure to indicate polarities.arrow_forward
- The image below shows the base cytosine and a methylated form of cytosine that occurs frequently in the human genome. Use your knowledge of DNA structure to answer the following questions: a) Does methylation of cytosine affect its ability to base-pair with guanine? Explain your answer. b) Would methylation of cytosine affect the binding of a protein that interacts with a C-G base-pair in the major groove?arrow_forwardImagine that you repeat the tRNA Selection experiment with modifications as follows: 1. Synthesize mRNA containing A's and G's only (poly-AG in random order). 2. Convert the amino acid Glutamic acid (Glu) on its tRNA to the amino acid Glutamine (Gln) as shown below. 3. Mix your poly-AG RNA, your artificial tRNA, and cell extract (contains ribosomes, amino acids, all normal tRNAs, and the energy source for translation). Phe Tyr GAA GAA Glutamic acid (Glu) is encoded by GAA and GAG, while Glutamine (Gln) is encoded only by CAA and CAG. What does the outcome of this experiment tell us about translation? Multiple codons code for each amino acid. An amino acid is selected based on the identity of the tRNA. The ribosome does the translation, i.e. it selects the amino acid regardless of the identify of the tRNA. The ribosome reads mRNA 3 bases at a time.arrow_forwardSickle cell anemia is a widespread disease in many African countries and can be caused by a change in the amino acid sequence from glutamic acid to valine. A patient is diagnosed with the disease and a genetic fingerprint reveals the following DNA sequence for the gene: (a) (b) (c) (d) (e) Write down the mRNA sequence for the given DNA sense strand indicating the polarity. Derive the polypeptide from the mRNA molecule using the table of the genetic code (Table Q1 below) again indicating the polarity of the peptide chain. Indicate the position in the DNA molecule that could have caused the disease and write down all possible point mutations in the DNA sequence that could have caused it. [ The polypeptide chain is polymerized at the ribosomes using t-RNA molecules. Write down all possible t-RNA molecules with their anti-codons that are used to polymerize the amino acid VAL. Indicate the polarity. 3'-TAC TGA GCA AGA TTA CAT ACT-5' Explain what is meant by redundancy of the genetic code.…arrow_forward
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