Ribonucleic acid (RNA) is a polymeric molecule essential in various biological roles in coding, decoding, regulation, and expression of genes. RNA and DNA are nucleic acids, and, along with lipids, proteins and carbohydrates, constitute the four major macromolecules essential for all known forms of life. Like DNA, RNA is assembled as a chain of nucleotides, but unlike DNA it is more often found in nature as a single-strand folded onto itself, rather than a paired double-strand. Cellular organisms use messenger RNA (mRNA) to convey genetic information (using the letters G, U, A, and C to denote the nitrogenous bases guanine, uracil, adenine, and cytosine) that directs synthesis of specific proteins. Many viruses encode their genetic information using an RNA genome. 

Some RNA molecules play an active role within cells by catalyzing biological reactions, controlling gene expression, or sensing and communicating responses to cellular signals. One of these active processes is protein synthesis, a universal function where RNA molecules direct the assembly of proteins on ribosomes. This process uses transfer RNA (tRNA) molecules to deliver amino acids to the ribosome, where ribosomal RNA (rRNA) then links amino acids together to form proteins. 

Like DNA, most biologically active RNAs, including mRNA, tRNA, rRNA, snRNAs, and other non-coding RNAs, contain self-complementary sequences that allow parts of the RNA to fold and pair with itself to form double helices. Analysis of these RNAs has revealed that they are highly structured. Unlike DNA, their structures do not consist of long double helices, but rather collections of short helices packed together into structures akin to proteins. In this fashion, RNAs can achieve chemical catalysis (like enzymes). For instance, determination of the structure of the ribosome—an enzyme that catalyzes peptide bond formation—revealed that its active site is composed entirely of RNA. QUESTIONS:

Q1:
1. What is the subject of the article?
2. What does the article discuss?
3. What does the exerpt talk about?
Q2:
1. What is RNA similar to?
2. What is something that is like RNA?
3. What can RNA be likened to?
Q3:
1. 
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3. 
Q4:
1. What does RNA do?
2. What is the purpose of RNA?
3. What is the job of RNA?
Q5:
1. What does RNA actively do?
2. What is the action that RNA performs?
3. What is RNA's main activity?
Q6:
1. How is RNA different from DNA?
2. What makes RNA distinct from DNA?
3. How does RNA differ from DNA?
Q7:
1. What shape are RNA?
2. What is the form of RNA?
3. Which shape do RNA take?
Q8:
1. Is RNA like enzymes?
2. Does RNA resemble enzymes?
3. Is RNA similar to enzymes?
Q9:
1. How is RNA similar to enzymes?
2. What makes RNA like an enzyme?
3. What resemblance does RNA share with enzymes?
Q10:
1. What kind of acids are RNA?
2. What is the acid that RNA is made of?
3. What sort of acid is RNA categorized as?
