BIOL 115 - DAY 4.pdf - Friday The Cell The Cell All cells have \u2022 Proteins perform most of cell\u2019s functions \u2022 Nucleic acids store transmit and

BIOL 115 - DAY 4.pdf - Friday The Cell The Cell All cells...

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Friday, May 29, 2020 The Cell The Cell - All cells have Proteins : perform most of cell’s functions Nucleic acids: store, transmit, and process information Carbohydrates: provide chemical energy, carbon, support, and identity Phospholipid membrane: serves as a selectively permeable membrane barrier - Discovery of Cells Cells were first described in 1665 by Robert Hooke - Got ants, fleas drunk to get them to stop moving and look at them under microscope - Bark of cork tree had squares that reminded him of rooms in a house The accumulation of scientific evidence over many years led to the cell theory - Cell Theory The cell is the basic unit of life All living things are made from one or more cells Cells are produced directly from the growth and division of other cells Each cell can regulate its internal conditions - Homeostasis - Homeostasis at the level of the tissue, organ, organ system and organism reflects the combined and coordinated actions of many cells Cells are Small - Why are cells small? Surface area to volume ratio If we were one giant cell, our body wouldn’t be able to di ff use 1
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Friday, May 29, 2020 Cell Morphology - Based on morphology, there are two types of cell: Prokaryote cells
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