Concept explainers
Interpretation:
The codons with a purine base A or G as the second base has to be compared whether the majority of amino acids coded by these codons are having hydrophilic or hydrophobic side chains.
Concept Introduction:
The amino acids whose side chains are not present in contact with the aqueous medium or the side chains are inside the protein core are said to be hydrophobic amino acids. The amino acids with hydrophobic side chains are Alanine, Valine, Leucine, Isoleucine, Proline, Phenylalanine, Methionine and Tryptophan.
The amino acids whose side chains are present in contact with the aqueous medium are said to be hydrophilic amino acids. The amino acids with hydrophilic side chains are Serine, Threonine, Cysteine, Asparagine, Glutamine, Histidine, Lysine, Aspartic acid, Glutamic acid, Arginine, Glycine and Tyrosine.
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Chapter 28 Solutions
Organic Chemistry
- Explain why the base sequence AGAC could not be a codon.arrow_forwardWhich of the following statements about the genetic code are true and which are false? Correct each false statement. a.Each codon is composed of four bases. b.Some amino acids are represented by more than one carbon. c.All codons represent an amino acid. d.Each living species is thought to have its own unique genetic code. e.The codon AUG at the beginning of a sequence is a signal for protein synthesis to begin at that codon. f.It is not known if the code contains stop signals for protein synthesis.arrow_forwardDraw the complete structure of the ribonucleotide codon UAC. For what amino acid does this sequence code?arrow_forward
- Describe the experiment that allowed researchers to first identify the codon for a specific amino acid.arrow_forwardWrite the base sequence for the mRNA that would be formed during transcription from the DNA strand with the base sequence GCCATATTG.arrow_forwardThe DNA template strand segment 3TTCAAACCGTAC5 upon transcription and translation produces the amino acid sequence Lys-Phe-Gly-Met. What is the amino acid sequence produced if a frameshift mutation occurs in which the third A base in the original DNA sequence is removed?arrow_forward
- Using the single letter abbreviations A, V, and L, as given in Table 22-1, list the tripeptides formed if alanine, valine, and leucine are all mixed together and peptide bonds are allowed to form in all possible combinations.arrow_forwardHuman brain natriuretic peptide (BNP) is a small peptide of 32 amino acids used in the treatment of congestive heart failure. How many nitrogen bases are present in the DNA that codes for BNP?arrow_forwardWhat is a codon?arrow_forward
- Suppose that 28% of the nucleotides in a DNA molecule are deoxythymidine 5'-monophosphate, and that during DNA replication the percentage amounts of available nucleotide bases art 22% A, 22% C, 28% G. and 28% T. Which base would be depleted first in the replication process?arrow_forward22-89 What kind of noncovalent interaction occurs between the following amino acids? (a) Valine and isoleucine (b) Glutamic acid and lysine (c) Tyrosine and threonine (d) Alanine and alaninearrow_forward
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