NATS 1675 Lecture Notes - Lecture 17: Endoplasmic Reticulum, Messenger Rna, Nuclear Membrane

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14 Aug 2016
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Nucleic Acids and Chromosomes
Nucleic Acids
Made of nucleotide subunits
Function in cell – make protein
Includes DNA and RNA
The Three Parts of a Nucleotide
Phosphate
Ribose (a five carbon sugar)
Nitrogen containing Base
Five Bases Are Found in Nucleotides
Adenine (A) and Guanine (G) are double-ringed purines
Cytosine (C), Thymine (T), and Uracil (U) are single-ringed pyramidines
In DNA, A pairs with T and G pairs with C
U is found in RNA and is paired with A in place of T
Summary of DNA and RNA Structural Differences
DNA RNA
Sugar is deoxyribose
Bases include A,T,C, and G
Double-stranded
Sugar is ribose
Bases include A, U, C, and G
Single-stranded
mRNA – messenger RNA
oTranscription part of DNA in
nucleus
tRNA – transfer RNA
oTranslation into protein cell
rRNA – ribosomal RNA
oPart of ribosome
Structures Involved in Protein Production
Nucleus
Ribosomes
Endomembrane system
Nucleus
Bound by a porous nuclear envelope
Houses chromatin: DNA associated with protein
Nucleolus contains ribosomal RNA (rRNA)
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