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RNA is a single-stranded molecule involved in the transcription and translation processes, with the final goal of synthesizing new proteins. Among the options, A is the correct one: RNA is single-stranded.
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The ribonucleic acid RNA is a single-stranded, linear polymer composed of nucleotides.
Sometimes RNA molecules can adopt a secondary double helix structure, which is intermittent.
Nucleotides are monomers composed of a sugar molecule, joined with a phosphate group and a nitrogenated base.
When talking about bases, we are referring to adenine, guanine, cytosine, and uracil. This last base is replacing the thymine of the DNA molecule.
RNA sugar group contains ribose, with no hydroxyl modifications typical of the deoxyribose. ARN pentose has two hydroxyl –OH groups joint to the carbon backbone.
The RNA molecule is synthesized in the nucleole and then migrate to different cytoplasmatic regions where they perform their functions.
RNA carries genetic information contained in the DNA molecule to build proteins
According to the ARN molecule type, different functions are accomplished
- snRNA ⇒ small nuclear RNA. These small molecules are implicated in the RNA maturation process.
- mRNA ⇒ messenger RNA. This molecule carries genetic information from the nucleus to the cytoplasm. mRNA is involved in transcription and translation processes.
- rRNA ⇒ ribosomal RNA. These molecules are the principal ribosomal component. Ribosomes have a principal role in reading the mRNA during the translating process.
- tRNA ⇒ transference RNA. These molecules are in charge of recognizing the mRNA codons and transferring correct amino acids to build the new synthesizing protein.
So, according to this information, we can answer the question.
- RNA is single stranded ⇒ TRUE.
- RNA is a double helix ⇒ FALSE. It is a single linear stranded molecule
- RNA is composed of cytosine, guanine, adenine, and thymine ⇒ FALSE. Uracil replaces thymine.
- RNA contains deoxyribose ⇒ FALSE. Contains ribose.
- RNA is found only in the nucleus of the cell ⇒ FALSE. It is in the nucleus and in the cytoplasm.
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