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What are the four types and functions of RNA? a. \(\mathrm{mRNA}\) is a single stranded transcript of DNA. rRNA is found in ribosomes. tRNA transfers specific amino acids to a developing protein strand. miRNA regulates the expression of mRNA strands. b. \(\mathrm{mRNA}\) is a single stranded transcript of rRNA. rRNA is translated in ribosomes to make proteins. tRNA transfers specific amino acids to a developing protein strand. microRNA (miRNA) regulates the expression of the mRNA strand. c. \(\mathrm{mRN}\) A regulates the expression of the miRNA strand. \(\mathrm{RNA}\) are found in ribosomes. tRNA transfers specific amino acids to a developing d. \(\mathrm{mRNA}\) is a single stranded transcript of DNA. rRNA transfers specific amino acids to a developing protein strand. tRNA is found in ribosomes. miRNA regulates the expression of the mRNA strand.

Step by step solution

01

Understand the function of mRNA

mRNA stands for messenger RNA and is a single-stranded copy of the DNA sequence of a gene. It carries the genetic information necessary for protein synthesis from the DNA to the ribosome.

02

Understand the function of rRNA

rRNA stands for ribosomal RNA and makes up the main component of ribosomes, where protein synthesis occurs.

03

Understand the function of tRNA

tRNA stands for transfer RNA and is responsible for bringing specific amino acids to the ribosome to be added to the growing protein chain.

04

Understand the function of miRNA

miRNA stands for microRNA and regulates gene expression by binding to complementary sequences on target mRNAs, leading to their degradation or the repression of their translation.

05

Choosing the correct option

Now that the functions of mRNA, rRNA, tRNA, and miRNA are clear, compare these functions with the given options. The accurate description of each RNA type matches with option a.

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Key Concepts

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

mRNA: The Messenger RNA

Messenger RNA, or mRNA, is essential in the process of protein synthesis. It serves as the intermediary that carries genetic information from DNA, located in the nucleus, to the ribosomes in the cytoplasm where proteins are synthesized. mRNA is a single-stranded RNA molecule transcribed from a DNA template. This transcription process allows the mRNA to carry the precise coding sequence that ensures proteins are synthesized correctly. Each triplet of nucleotides, called a codon, on the mRNA corresponds to a specific amino acid, forming the blueprint for protein construction.

rRNA: The Ribosomal RNA

Ribosomal RNA (rRNA) is a key structural and functional component of ribosomes, the cellular machinery responsible for protein synthesis. Ribosomes are composed of rRNA and protein; they translate encoded information from mRNA to synthesize proteins. There are two main types of rRNA within the ribosome - the small rRNA and the large rRNA. These rRNA molecules aid in binding mRNA and tRNA, ensuring the correct alignment during protein synthesis. The catalytic activity of rRNA also facilitates the formation of peptide bonds between amino acids, a crucial step in building a protein's polypeptide chain.

tRNA: The Transfer RNA

Transfer RNA (tRNA) is crucial for translating the nucleotide sequence of mRNA into a sequence of amino acids to form proteins. Each tRNA molecule carries a specific amino acid and recognizes the corresponding codon on the mRNA through its anticodon region. The anticodon-codon interaction ensures that amino acids are added in the proper sequence during protein synthesis. The primary function of tRNA is to deliver the appropriate amino acids to the ribosome, where rRNA catalyzes the formation of peptide bonds between these amino acids. This step-by-step elongation of the protein chain is critical for the accurate and efficient synthesis of proteins.

miRNA: The MicroRNA

MicroRNA (miRNA) is a small, non-coding RNA molecule involved in the regulation of gene expression. miRNAs typically bind to complementary sequences on target mRNAs, leading to repression of translation or degradation of the mRNA. This regulatory mechanism allows cells to fine-tune protein production, playing a critical role in many biological processes such as development, differentiation, and response to stress. miRNAs are derived from larger precursors that are processed by cellular enzymes to produce functional miRNA molecules. The specificity of miRNA binding to target mRNAs makes them important tools for controlling the expression levels of a wide array of genes in various physiological and pathological contexts.