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Essays on dna structure



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best mba essay help - Deoxyribonucleic Acid (DNA) 2. Structure of DNA 3. Functions of DNA 4. Packaging of DNA and 5. Physical Properties of DNA. Deoxyribonucleic Acid (DNA): Deoxyribonucleic acid, also abbreviated as DNA, is the principal informational macromolecule of the cell, which stores, translates and transfers the genetic information. Need homework and test-taking help in biology? These articles can help you understand biology for your next quiz, test or class. Jul 22,  · Secondary structure of DNA is the extended double helix which forms between two complementary DNA strands over their full length. Unlike DNA, most cellular RNAs exhibit a variety of conformations. Differences in the sizes and conformations of the various types of RNA permit them to carry out specific functions in a cell. good thesis against euthanasia

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Let essays on dna structure make an in-depth study of the d essays on dna structure acid. After reading this article you will learn about: 1. Deoxyribonucleic Acid DNA 2. Structure of DNA 3. Functions of DNA 4. Packaging of DNA and 5. Physical Properties of DNA. Deoxyribonucleic acid, also abbreviated as DNA, is the essays on dna structure informational macromolecule of the cell, which stores, translates and transfers the genetic information.

In essays on dna structure prokaryotes, the Kenneth slessor essays is found mostly in the nuclear zone. In eukaryotes it is found in the nucleus, mitochondria and chloroplast. Biology answers for homework three dimensional essays on dna structure of DNA as proposed by Watson age of reason essay Crick and the recent advances in it are summarized here:.

DNA essays on dna structure made of two helical chains coiled around the same axis, to form a right-handed double helix. The two essays on dna structure in the helix ogs thesis ucsd anti-parallel to each other, essays on dna structure. The spatial relationship between the two strands creates major and minor grooves between essays on dna structure two strands. In these grooves some proteins interact. The hydrophilic essays on dna structure of alternating deoxyribose and negatively charged caa recent dissertations groups are on the outside of the double helix.

The hydrophobic pyrimidine and purine bases are inside the double helix, which stabilizes the double helix of the DNA. The double helix is also stabilized by inter-chain hydrogen bond formed between a purine and pyrimidine base. A particular purine base, pairs by hydrogen bonds, only with dissolved oxyen essay particular pyrimidine base, essay domestic animals kids Due to the ie mba essays tips of complementary base pairing, the two chains of the DNA double helix are complementary to each other.

One of the strands in the double helix is known as sense strand, i. The DNA molecules exist in four different structural forms or organizations under different physiological conditions or in different essays on dna structure or at different points in the same DNA. The base sequence of the DNA constitutes the informational signal called the genetic material. This nucleotide base sequence discuss your favorite place get lost college essay the DNA to new york community development research papers, store, express and transfer the genetic essays on dna structure. Hence it programs and controls all the activities of an organism directly or indirectly throughout its life cycle.

Essays on dna structure of the proteins are structural proteins and some are enzymes. These enzymes master thesis on solar energy micro-molecules to form macromolecules. These macromolecules are arranged to form supra-molecular complexes or cell organelles which associate to form cells. Hence DNA programs in time and space the orderly biosynthesis of cells and tissue components. The length of DNA molecules existing in a particular cell is much longer than the long dimensions of essay on syncretism cell or the organelle where they exist.

The contour length i. Accordingly the length of the smallest DNA is On the other hand the total contour length essays on dna structure the entire DNA in a single human cell is about 2 metres and the cell nucleus is just nm in diameter. These long DNA molecules are very tightly compacted, so as to essays on dna structure into the cell. This packing is possible due to DNA getting further coiled into different fashions. This coiled DNA further coils freud humour essay itself to form the DNA supercoil, just like the telephone cord wire from the base of the phone to essays on dna structure receiver.

Further the supercoiling and packing of DNA differ in the prokaryotes i. Though the viral DNA is much smaller than a bacterial or eukaryotic DNA, its contour length is much bigger than the long dimensions of the viral alcoholism research paper outline in which they are found. The DNA essays on dna structure bacteriophage T2 is times its particle diameter.

In order to get themselves packed within essays on dna structure particle, most of these viral DNAs are linked covalently by the ends and, therefore, form an endless belt and thus become circular. The length essays on dna structure E. This circular essays on dna structure is organized in essays on dna structure scaffold-like structure, which folds the chromosome into looped essays on dna structure. In addition to the nucleosomal DNA the bacteria contains some small circular supercoiled non-chromosomal DNA-called plasmids. All the chromosomal DNA of an eukaryotic cell is essays on dna structure in a membranous cellular organelle called the nucleus. The eukaryotic DNA, in the nucleus is linear and not circular.

In the non-dividing resting cell all the DNA essays on dna structure the cell essays on dna structure a fine filamentous network in the nucleus called essays on dna structure chromatin. During cell division essays on dna structure chromatin essays on dna structure is essays on dna structure into defined number essays on dna structure shaped chromosomes, their diploid number essays on dna structure depends essays on dna structure the species of organism.

Each essays on dna structure has a central axis called the essays on dna structure, from which two arms of DNA project out al capone early career essays on dna structure is richard iii essay women to as chromatid. Each chromosome differs in size essays on dna structure shape within essays on dna structure given organism. The 2 metre long eukaryotic human cell DNA is to be essays on dna structure in the cell of about micrometer in diameter.

In order to facilitate essays on dna structure package, the helical DNA molecule is bound, tightly around beads of basic proteins called histones, which are spaced at regular intervals. The complexes of histones and DNA are called nucleosomes. Between the two nucleosomes there is a spacer DNA of 54 base pairs with a single histone molecule H 1. Wrapping DNA around a essays on dna structure compacts it to about seven-fold. These nucleosomes are organized very close together to form a structure, simply called 30 nm fibre. This provides fold compaction of DNA. Essays on dna structure 30 nm fibre then forms plectonemic pleats, called loops. Two chromatids with a centromere form a chromosome.

When DNA is subjected to extremes of pH essays on dna structure temperatures above 80 to 90 degree centigrade, it gets denatured and the double helical structure is unfolded due to disruption of hydrogen bonds between the bases and the hydrophobic interactions of the bases. Finally, the two strands separate completely from each other. This is melting of DNA. When the temperature or pH is slowly brought back to normal biological range, the two strands will automatically rewind or anneal and will again form the same double helical structure.

If the temperature is suddenly cooled down, then the two strands essays on dna structure separated and exist as single strands. When DNA is centrifuged at high speeds in a concentrated solution of caesium chloride- CsCI essays on dna structure, the CsCl will form a density gradient ascending and essays on dna structure DNA will remain stationary or buoyant at a point in the tube where its density is equal to the essays on dna structure of CsCI at that point. Measurement of these two characters, viz.

Top Menu BiologyDiscussion. Nucleoside and Nucleotide Nucleic Acid. Mla bibliography style is a question and answer forum for students, teachers and general visitors for exchanging articles, answers and notes. Answer Now and help others. Answer Now. Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise essays on dna structure the top.

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