Question

Which rRNA is present in prokaryotes and eukaryotes?

Answer 1

Ribosomes of prokaryotes such as bacteria, the SSU contains a single small rRNA molecule (~1500 nucleotides) while the LSU contains one single small rRNA and a single large rRNA molecule (~3000 nucleotides). These are combined with ~50 ribosomal proteins to form ribosomal subunits. There are three types of rRNA found in prokaryotic ribosomes: 23S and 5S rRNA in the LSU and 16S rRNA in the SSU.

In the ribosomes of eukaryotes such as humans, the SSU contains a single small rRNA (~1800 nucleotides) while the LSU contains two small rRNAs and one molecule of large rRNA (~5000 nucleotides). Eukaryotic rRNA has over 70 ribosomal proteins which interact to form larger and more polymorphic ribosomal units in comparison to prokaryotes.[4] There are four types of rRNA in eukaryotes: 3 species in the LSU and 1 in the SSU.[5] Yeast has been the traditional model for observation of eukaryotic rRNA behavior and processes, leading to a deficit in diversification of research. It has only been within the last decade that technical advances (specifically in the field of Cryo-EM) have allowed for preliminary investigation into ribosomal behavior in other eukaryotes.[6] In yeast, the LSU contains the 5S, 5.8S and 28S rRNAs. The combined 5.8S and 28S are roughly equivalent in size and function to the prokaryotic 23S rRNA subtype, minus expansion segments (ESs) that are localized to the surface of the ribosome and found only in eukaryotes. A eukaryotic SSU contains the 18S rRNA subunit, which also contains ESs. SSU ESs are generally smaller than LSU ESs.

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Answer 2

Answer:

The rRNA is arranged into four strands in eukaryotes and three strands in prokaryotes in ribosomes.

Explanation:

• The SSU (1500 nucleotides) and LSU (3000 nucleotides) of prokaryotic ribosomes, such as those found in bacteria, contain a single small rRNA molecule and a single large rRNA molecule, respectively. To create ribosomal subunits, these are joined with about 50 ribosomal proteins. Prokaryotic ribosomes contain three different types of rRNA: 16S rRNA in the SSU, 23S and 5S rRNA in the LSU.
• Prokaryotes with 70S ribosomes are made up of a large 50S subunit and a 30S subunit.
• A 5S RNA subunit with 120 nucleotides, a 23S RNA subunit with 2900 nucleotides, and 31 proteins make up the large subunit (the 50S).
• The LSU contains two small rRNA molecules and one molecule of large rRNA (about 5000 nucleotides) while the SSU only contains one small rRNA (1800 nucleotides) in eukaryotes like humans. In comparison to prokaryotes, eukaryotic rRNA contains over 70 ribosomal proteins that interact to form larger and more polymorphic ribosomal units.
• The rRNA is arranged into four strands in eukaryotes and three strands in prokaryotes in ribosomes. The nucleolus is where eukaryote ribosomes are made and assembled. The two ribosomal subunits (one small and one large) that make up the finished ribosome are formed when ribosomal proteins enter the nucleolus and combine with the four rRNA strands (see Figure 1). The nuclear pores allow the ribosome units to exit the nucleus, where they reunite in the cytoplasm to begin protein synthesis. The two components of a ribosome are separated when protein synthesis is not occurring.

Reference Link

• https://brainly.in/question/2012016
• https://brainly.in/question/325317