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waterwater usually forms about 50 to90 part of living protoplasm life upon earth originated in the ocean and the conditions of that aqueous primeval
nucleic acidsfriedrich miescher 1868 discovered the presence of these compound in protoplasm but altman 1889 introduced the term nucleic
lipidslipids are oily or greasy organic compound forming about 3 of protoplasm these are also compound of carbon hydrogen and oxygen but unlike
carbohydratesthese form about 1part of protoplasm they are comparatively simpler compounds of carbon hydrogen and oxygen in the ratio 121 the ratio
protoplasmic theorythe living matter which forms the bodies of all living being is a special type of highly organized jelly like viscous semi fluid
causes of cancerscientists have identified the cellular genes that code for those proteins which jointly control and regulate cell growth and
what is cancerbesides aids cancer is another deadly human disease of our times about which people are panicky all over the world it is estimated that
clinical symptoms of hivgenerally a person infected with hiv does not show any apparent symptoms for a number 3 to 12 of years ten to fifteen percent
important modern viral diseasesby extensive use of vaccination and chemotherapy certain serious viral diseases of the past like smallpox have
nature defences against viral infections1 interferons - in 1957 issue and lindenmann discovered that vertebrate cells infected
pathogenesis of virusesviral diseasesan indicated before viruses cause a number of infectious human diseases from minor ailments like common cold to
how viruses multiplyobligatory parasitism - outside cells viruses are nonliving inactive particles but after entering into live cells these
viriods and prionsviroids in 1971 todiener reported that the spinde tuber disease of potato causing gnarling and cracking
classification of virusesno evolutionary or phylogenetic exist between viruses a nature system of classification cannot therefore be devised
nature and distribution of virusesalthough several infectious diseases of animals and plants had been found to be caused by viruses during early 20th
modern theorynaturalistic theory according to this theory life originated upon our earth spontaneously from nonliving matter but there are two
biotic balance of naturea nineteenth century biologist is reported to have expressed glory of britain is due to its old maids he reasoned healthy
animals vs plantsorganisms are of two main types animals and plants although all the above mentioned unifying concepts of biology apply equally to
modern biologyincreasing advancement in biotechnology has brought about a veritable explosion of biological knowledge since early 1950sthis vast
non living vs living matteras is clear from above account the energy of matter resides in its chemical organization the total potential
living mattersince at the subatomic level all matter is basically similar the fundamental chemical and physical principles are equally applicable to
energycontrary to matter energy neither occupies space nor possesses mass hence it is defined not on physical but on operational or
kinds of matteron basis of its chemical organization matter id of three categories elements compounds and mixturean element is composed of obviously
nature matter and energynature is not just our immediate surrounding or environment but is the whole universe of cosmos study of the origin
how does respiration in animals occur what is respiration what are the common types of