DNA and RNA Structure

There are three different types of RNA.

The function of mRNA is to...

• read, or copy, the DNA code

• bring amino acids to the ribosome during protein synthesis

• assemble the amino acids into proteins

What category of molecule does DNA and RNA belong to?

• carbohydrates

• lipids

• nucleic acids

• proteins

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What are the building blocks of RNA and DNA?

• monosaccharides

• amino acids

• fatty acids

• nucleotides

DNA _____________________________________ and RNA ____________________________.

• is involved in actual protein synthesis, holds coded hereditary information

• transports amino acids to the ribosome, transports finished proteins to tissues

• holds coded hereditary information, is involved in actual protein synthesis.

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There are three different types of RNA.

The function of rRNA is to...

• read the DNA code.

• bring amino acids to the ribosome during protein synthesis.

• assemble the amino acids into proteins.

When and why does DNA need to replicate?

• DNA replicates before protein synthesis can happen.

• DNA only replicates in order to mutate.

• It replicates before mitosis and meiosis so all cells can have the correct amount of DNA for their ultimate function.

• none of the above

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Two other differences between RNA and DNA are that...

• RNA is made of amino acids and DNA is made of lipids.

• the number of helices and the types of nitrogen bases in the molecules.

• the fact that one has a "backbone" while the other does not

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What is a nucleotide made of?

• one glycerol and three fatty acids molecules

• an amino group and a carboxyl group

• monosaccharides and disaccharides

• a 5-carbon sugar, a phosphate group and a nitrogen base

RNA and DNA differ in the types of 5-carbon sugars in their nucleotide. Which statement below is correct?

• RNA contains lactose while DNA contains maltose.

• DNA contains ribose while RNA contains deoxyribose.

• RNA contains sucrose while DNA contains glucose.

• DNA contains deoxyribose while RNA contains ribose.

Because of the fact that A always pairs with T and C always pairs with G, DNA is

• is different in every cell in the body

• self-replicating

• indefinite in length

• none of the above