01:119:150 Lecture Notes - Lecture 4: Nuclear Membrane, Nuclear Pore, Nuclear Dna

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Cells are the fundamental unit of life. All living things are composed of cells. Requirements of a cell: enclosed in a membrane, transportation, control what enters the cell and what exits the cell, ability to carry out energy transformations a. Source of energy and a way to transform that energy into a usable form. Instructions - dna a: control the cell"s activity, reproduction. Cell sizes generally range from 1-100 micrometers. Micrometer = 1 x 10 -6 m or one-millionth of a meter. The small size of cells is a function of surface area to volume ratio. Sa = h x w x number of sides. Greater surface area to volume ratio is good - lots of surface area means lots of transport. Organelles work together to keep individual cells healthy and produce required raw materials. Surrounded by two membranes, together called the nuclear envelope.

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