What does it mean that RNA is single stranded?
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What does it mean that RNA is single stranded?
Single-stranded RNA (ssRNA) is the simplest form of genetic molecule and constitutes the genome in some viruses and presumably in primitive life-forms. We systematically designed RNAs with various structures and observed dsRNA formation during replication using an RNA replicase (Qβ replicase).
What is the base pairing for RNA?
The four bases that make up this code are adenine (A), thymine (T), guanine (G) and cytosine (C). Bases pair off together in a double helix structure, these pairs being A and T, and C and G. RNA doesn’t contain thymine bases, replacing them with uracil bases (U), which pair to adenine1.
How does base pairing even happen if RNA is single stranded?
RNA is single-stranded, and thus, no base pairing occurs. Think of a strand of DNA. Each base pairs with a specific partner, allowing us to determine their percentages: adenine and thymine are always equal, and cytosine and guanine are always equal.
Does RNA form base pairs with A single strand?
Although RNA is a single-stranded molecule, researchers soon discovered that it can form double-stranded structures, which are important to its function. Such base-pairing of RNA is critical for many RNA functions, such as the ability of tRNA to bind to the correct sequence of mRNA during translation (Figure 3).
How do complementary base pairs contribute to intramolecular base pairing within an RNA molecule?
In a double‐stranded DNA or RNA, this refers to the Watson‐Crick pairing of complementary strands. In a single‐stranded RNA or DNA, the intramolecular base pairs between complementary base pairs determines the secondary structure of the molecule.
See text. Picornaviruses are a group of related nonenveloped RNA viruses which infect vertebrates including fish, mammals, and birds. They are viruses that represent a large family of small, positive-sense, single-stranded RNA viruses with a 30 nm icosahedral capsid.
Which of the following is single stranded RNA virus?
Polioviruses are single-stranded RNA viruses belonging to the family Picornaviridae. They have a naked protein capsid with a dense central core. The capsid consists of four structural proteins, VP1, VP2, VP3, and VP4.