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Chapter 9: Problem 6

Most codons specify a(n) _____. a. protein b. polypeptide c. amino acid d. mRNA

Short Answer

Expert verified
Most codons specify an amino acid.

Step by step solution

01

Understanding Codons

A codon is a sequence of three nucleotides in mRNA that corresponds to a specific amino acid or a start or stop signal during protein synthesis.
02

Review Codon Functions

Codons play a critical role in translating genetic information from mRNA. Each codon specifies an amino acid to be added to the growing polypeptide chain during protein synthesis.
03

Identifying the Correct Answer

Given that codons are part of the translation process in protein synthesis, and each three-nucleotide codon corresponds to an amino acid, the correct answer aligns with option 'c' - amino acid.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Amino Acids
Amino acids are like the building blocks of proteins. Just as a house is built with bricks, proteins are constructed using amino acids. There are 20 different amino acids, each with a unique structure and function.
The sequence of these amino acids determines the particular protein and its function in our bodies. In the world of biology, amino acids are essential for numerous processes, including hormone synthesis and metabolism.
They are linked together in chains known as polypeptide chains, which fold into specific three-dimensional shapes to form proteins. Without the correct sequence of amino acids, proteins could not perform their necessary roles in cellular functions.
Protein Synthesis
Protein synthesis is the process cells use to produce proteins. This process occurs in two main stages: transcription and translation.
  • **Transcription:** DNA is used to create messenger RNA (mRNA) in the cell nucleus. This mRNA acts as a template that carries the genetic information from the DNA.
  • **Translation:** The mRNA travels to the ribosome, where it guides the synthesis of proteins. The ribosome reads the sequence of mRNA nucleotides in groups of three, called codons, each of which specifies an amino acid.
Protein synthesis is vital because proteins perform essential tasks in the body, like acting as enzymes, hormones, and structural components. Without protein synthesis, our cells would not function properly.
mRNA Translation
mRNA translation is the process of decoding the mRNA to synthesize a polypeptide or protein. Think of it like translating a book from one language to another.
  • **Start and Stop Codons:** The translation begins with a start codon, typically AUG, and ends with a stop codon (UAA, UAG, or UGA).
  • **Role of Ribosomes:** Ribosomes are the cellular machinery that reads the mRNA codons and matches each codon with the appropriate amino acid with the help of transfer RNA (tRNA).
  • **Building Polypeptide Chains:** As the ribosome moves along the mRNA, it links the amino acids together in the proper order, forming a polypeptide chain that eventually folds into a functioning protein.
This translation process is crucial as it ensures that the genetic code is accurately interpreted, leading to the correct production of proteins needed for the cell's survival and function.

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Most popular questions from this chapter

Match the terms with the best description. a. protein-coding segment b. gets around c. read as base triplets d. removed before translation e. occurs only in groups f. complete set of 64 codons g. binding site for RNA polymerase genetic message _____ promoter _____ polysome _____ exon _____ genetic code ____ intron ____ transposable element _____

_____ can cause mutations. a. Replication errors b. Transposons c. Ionizing radiation d. Nonionizing radiation e. \(b\) and \(c\) are correct \(f\). all of the above

Anticodons pair with _____. a. mRNA codons b. DNA codons c. RNA anticodons d. amino acids

A chromosome contains many different gene regions that are transcribed into different _____. a. proteins b. polypeptides c. RNAs d. a and b

Where does translation take place in a typical eukaryotic cell? a. the nucleus b. ribosomes c. the cytoplasm d. \(b\) and \(c\) are correct
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