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Analyzing Molecular Structure Levels in DNA, tRNA, and mRNA
Chapter 9, Problem 1(choose chapter or problem)
Consider the following in light of the concept of levels of structure (primary, secondary, tertiary, quaternary) as defined for proteins.
(a) What level is shown by double-stranded DNA?
(b) What level is shown by tRNA?
(c) What level is shown by mRNA?
Questions & Answers
QUESTION:
Consider the following in light of the concept of levels of structure (primary, secondary, tertiary, quaternary) as defined for proteins.
(a) What level is shown by double-stranded DNA?
(b) What level is shown by tRNA?
(c) What level is shown by mRNA?
ANSWER:Step 1 of 3
Protein structure levels are: primary (sequence of amino acids), secondary (local folded structures such as alpha-helix and beta-sheet), tertiary (the complete three-dimensional structure of a single polypeptide chain), and quaternary (the assembly of multiple polypeptide chains). Each contributes to the protein's unique shape and functionality.
(a) Double-stranded DNA primarily exhibits the secondary structure. The double helix structure formed by the complementary base pairing of nucleotides (A-T and G-C) represents the secondary structure of DNA. This secondary structure is crucial for the stability and replication of DNA. However, it is important to note that DNA can also exhibit tertiary and quaternary structures when considering its supercoiling (the twisting and winding of the double helix) or association with proteins (such as histones) to form chromatin.
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Analyzing Molecular Structure Levels in DNA, tRNA, and mRNA
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This video explores the concept of structural levels (primary, secondary, tertiary, and quaternary) in biomolecules, focusing on double-stranded DNA, tRNA, and mRNA to understand the diverse ways these molecules exhibit these structural layers.