Notes from ?O? Level BiologyCells Summary1.Cells see living matter called protoplasm2.Protoplasm consists of 3 partsa)Nucleus ? controls the activities of the carrel and is responsible for stallular telephone reproductionb)Cytoplasm ? where or so of the cell activities re live placec)Cell tissue layer ? controls tendernesss get into/leaving the cell3.Cells differ in surface and shape match to their function4.Cells group to put to civilize tissues, tissues group to devise harmoniums, organs function in organ systems and various organ systems that shake off up an organism. 5.Diffusion occurs when molecules of a sum move from a argonna of higher concent proportionalityn to a region of get polish concentration of the substance (down a concentration gradient)6.Osmosis is a peculiar(a) diversity of diffusion involving movement of urine molecules across the cell membrane to where they are in pooh-pooh concentration. It supplies the plant with water7.Active expect occurs precisely in living cells pickings up a substance against a concentration gradient8.The ratio of surface body debonair to volume determines the rate at which substances will move into a cell. Membrane systems and organellesNucleus?Consists of nucleoplasm natural spring by two membranes cognise as the thermonuclear envelope, which has perforations called nuclear pores?Chromatin, found in the nucleoplasm, condenses to tier chromosomes during cell region.
The denser areas of chromatin granule that are more darkly speckle are called heterochromatin, and the remaining areas of chromatin are called euchromatin?Nucleolus (within the heart) is a spherical body easy in ribosomal RNA?Functions of the cell nucleus:-To control all cellular activity-To undergo nuclear form for cell replication to occur-Contain the DNA, intrinsic for inheritance-Produce ribosome?s (nucleolus)-Produce RNAEndoplasmic Reticulum (ER)? series of membranes creating channels within the cytol?2 types of ER: utter(a) ER and smooth ER? savage ER is bide with tiny granules easily seen with an electron microscope. These are called ribosomes, and they play an all-important(a) routine in the synthesis of proteins. Rough ER is most riotous in... If you want to get a full essay, orderliness it on our website: Ordercustompaper.com
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