Prescott's Microbiology
Prescott's Microbiology
11th Edition
ISBN: 9781260211887
Author: WILLEY, Sandman, Wood
Publisher: McGraw Hill
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Chapter 18, Problem 1RC
Summary Introduction

To determine: The key structural elements of DNA, RNA and proteins.

Introduction. The genes are the sequence of nucleotides that are present on the chromosomes and encode for a specific protein that plays a crucial role in the functioning of the different processes in an organism. The gene is located at specific gene loci and can be structural or regulatory in nature.

Expert Solution & Answer
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Explanation of Solution

The DNA (deoxyribose nucleic acid) is made up of stacks of nucleotides that are joined to each other by phosphodiester bond vertically and horizontally by H-bonds. The adenine and thymine forms two H-bonds while the bases guanine and cytosine forms three H-bonds.

The RNA is made of ribose sugar which contains hydroxyl group at four positions. The RNA is made of four nitrogenous bases that are cytosine, adenine, guanine and uracil. The RNA is an enzyme in most eukaryotes and genetic material of most of the viruses. It differs from DNA in terms of sugar and thymine nitrogenous base.

The proteins are made of amino acids. The amino acids are of 20 types that combine in a varied manner to form proteins. The amino acids join together by peptide bonds. Proteins act as major substrates and reactants for the metabolic pathways. All the enzymes in the body that are crucial for the biochemical reactions are proteins. The primary structure of protein is formed by the linear arrangement of amino acid in a chain form that is not functional. The secondary structure of the proteins is formed by the formation of bonds between the amino acids in the linear chain.

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