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The structure of ribonucleic acid
Learning Objectives:
Describe the structure of ribonucleic acid (RNA)
Describe the structure and role of messenger
Describe the structure and role of transfer RNA
(tRNA)…read more

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RNA = ribonucleic acid
RNA is a single -stranded polymer
Each RNA nucleotide consists of:
A pentose sugar (ribose)
A phosphate group
A base ­ adenine, cytosine, guanine,
uracil (instead of thymine)
RNA used in protein synthesis is
messenger RNA (mRNA) or transfer
RNA (tRNA).…read more

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RNA contains the pentose sugar
DNA contains the pentose sugar
deoxyribose.…read more

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Messenger RNA (mRNA)
mRNA is used to transfer the DNA code from the
nucleus to the cytoplasm.
mRNA is complementary to the DNA code.
mRNA is small enough to leave the nuclear pores.
Once in the cytoplasm, mRNA associates with the
mRNA is used to determine the sequence of amino
acids during protein synthesis.
mRNA is easily broken down and only exists whilst it
is needed to manufacture a protein.
The sequence of nucleotides in the mRNA is
referred to as the genetic code.…read more

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Transcription (forming mRNA)…read more

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