What polypeptide product would you expect from a poly-G mRNA that is 30 nucleotides long?

Short Answer

Expert verified

The polypeptide product of poly G mRNA is made of 10 glycine amino acids. Poly-G mRNA has G residues in which three G residues get translated into glycine amino acids.

Step by step solution

01

Description of gene expression

Gene expression is the molecular dogma of molecular biology. The first step is the transcription that converts DNA into mRNA. The next step is the translation that converts the mRNA into protein via the process of translation.

02

Definition of mRNA

The mRNA is the crucial intermediate product in the gene expression mechanism. It is produced from the process of transcription, which converts the DNA into messenger RNA.

The mRNA molecules are a single-stranded component that is complementary to the DNA strand.

03

Polypeptide product from poly-G mRNA

The three-nucleotide present in the RNA corresponds to a particular amino acid. It is known as an amino acid codon.

The mRNA sequence present in the poly-G mRNA of 30 long nucleotides consists of GGG residues. Each three-letter codon of GGG gets translated into glycine. It is the amino acid that possesses hydrogen in the side chains.

The given nucleotide length is 30, in which three letters correspond to one amino acid, glycine. Therefore, a total of 10 glycine amino acids is formed from the poly-G mRNA.

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Most popular questions from this chapter

Which component is not directly involved in translation?

  1. GTP

  2. DNA

  3. tRNA

  4. ribosomes

The height of a stack letters in a logo indicates the predictive power of the stack (determined statistically). If the stack is tall, we can be more confident in predicting what base will be in that position of a new sequence is added to the logo. For example, at position2 in the sequence alignment, all 10 sequences have a G: the probability of finding a G there in a new sequence is very high, as is the stack in the sequence logo. For short stacks, the bases all have about the same frequency, so it’s hard to predict would be at those positions. (a) Looking at the sequence logo, which two positions have the most predictable bases? What bases do you predict would be at those positions in a newly sequenced gene? (b) Which 12 positions have the least predictable bases? How do you know? How does this reflect the relative frequencies of the base shown at these positions in the sequence alignment? Use the two leftmost positions of the 12 as examples in your answer.

Which of the following mutations would be most likely to have a harmful effect on an organism?

  1. a deletion of three nucleotides near the middle of a gene

  2. a single nucleotide deletion in the middle of an intron

  3. a single nucleotide deletion near the end of the coding sequence

  4. a single nucleotide insertion downstream of, and close to, the start of the coding sequence.

What is a promoter? Is it located at the upstream or downstream end of a transcription unit?

Which of the following is not true of a codon?

  1. It may code for the same amino acid as another codon.

  2. It never codes for more than one amino acid.

  3. It extends from one end of a tRNA molecule

  4. It is the basic unit of the genetic code.

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