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#1
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Rds topic wise notes
I WILL MAKE NOTES OF EDS , IT IS MY PERSONAL REQUEST FROM YOU TO MAKE POSSIBLE AMENDMENT IN THE ANSWER AS ANY ONE FINDS APPROPRIATE ADDITION.
I AM STARTING FROM BIOLOGICAL PORTION CELL cell is the structural and functional unit of life cell was discovered by robert hook in 1531 nucleus was discovered by robert brown in 1631 cell theory presented in 1661 by scheldein and schwanN CELL THEORY IT has three main points new cell forms from pre existing cell (biogensis ) all living organism formed from unicellular and multicellular , cell is the structural and functional unit of life Structure of cell[COLOR="Blue"[/COLOR] cell has different structure . cell wall cell organelles cell membrane cytoplasm cell wall it is absent in animal cell , while in plant cell it is present in outer most covering composition it is made up of chittin , function main function is to provide rigidity to the plant cell and protection against cytoplasm changes cytoplasm it is the gel like material inside cell wall . it has two part cyto is the solution while sol is the gel ,it also stores mineral and maintain liquid pressure different organelles of cell mitochondria it is the power house of cell function , it prepares ATP molecules from carbohydrates structure has two tubules and DNA it is self replicating RIBOSOMES cell consists of network of tubules and inter connected extension TYPES OF RETICULUM there are two types of reticulum ROUGH ENDOPLASMIC RETICULUM SMOOTH ENDOPALSMIC RETICULUM ROUGH ENDOPLASMIC RETICULUM RER has attached ribosomes , function of ribosomes it synthesize protein SMOOTH ENDOPLASMIC RETICULUM it is with out ribosomes. reticulum is also called protein factory GOLGI COMPLEX it was discovered by golgi it is a sac like body FUNCTION function is to break down harm ful substances lysozimes a splitting body , secrete enzymes for the break down of harm ful substances , function its deficiency leads to development or growth effects in later stage or earlier phase cell membrane present in animal and plant cell its composition is 60-80%protein while 40-20% lipids and carbohydrates . function it is selective permeable , material can flow into or outside the cell membrane. vacuoles it is a present in the center of plant cell while absent in animal cell function provide rigidity maintain cell sap contain salts , electrolytes . plastid these are chemical in plant cell. three types are known chloroplast lit is in the leaves of plant , leaves green color is owning to chloroplast function plants photosynthesis process takes place in leaves chromoplast different color of petals owing to chromoplast function it attracts insects to assist in pollination lecoplat . it is colorless , its function is to store foods in leaves nucleus the control house of cell , it has DNA and RNA molecules. it has two part nucleoplasma and nuclear membrane nuclear membrane is similar to the cell membrane , nucleoplasma has nuclei acid , in nucleus genetic material is abundant to transmit hereditary character from parents to off spring , different between dna and rna dna is deoxyribo nuclei acid while rna is ribonuclei acid dna is hereditary material while rna is helpful in protein synthesis dna has thamine while rna has uracil dna is double stranded while rna is single stranded dna has no type while rna has three types ribosomes do not attach with it while rna has ribosomes difference between plant and animal cell plant cell has cell wall while animal cell has no cell wall vacuole is present in plant cell while animal cell no vacuole . chloroplast , chromoplast and leucopast are found in plant while animal cell has no such complexity centriole is absent in plant cell while animal cell has centriole nucleus is in center in animal cell while palnt cell due to vacuole it push towards side way |
#2
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chromosomes
it is a thread like structure visible during cell division . its a hereditary material to transfer character from parents to offspring , every species has specific number of chromosomes , human being has 46 chromosomes , 22 pairs are similar while 23 pair is called sex chromosomes , it is different in both male and female , in male it is XY while female it is XX.
GENES it is the measurement of specific traits in any species, genes are the arrangement of nucleotide, it is the sub unit ,gene of the coding region encodes instruction to produce specific protein or enzymes. chromosomes these are the condensed and over condensed material inside the nucleus , its pairing during meisios transfers character to offspring . cell division it is continue process for growth , repair and reproduction of an living organism . cell division is necessary for continuity of species. there are two types of division mitosis meiosis mitosis it is a type of division in which two daughter cell with half number of chromosomes in each cell . for example in human being total number of chromosomes is 46 after mitosis division two cells with 23 chromosomes in each cell meiosis it is a kind of cell division in which no of chromosomes becomes half in daughter cell as compare to the parent cell. this division took place in two phases , meiosis 1 and meiosis 2 , four daughter cells are formed passing through different stages, prophase , anaphase , telophase and metaphase . |
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