CH 3: 1. Describe the general characteristics of a composite cell.

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Cell Membrane

The semipermeable membrane surrounding the cytoplasm of a cell.

Outermost Perimeter

composed mainly of lipids and proteins, with some carbohydrate.

Selectively Permeable

regulates movement of substances into and out of the cell.

Fluid Mosaic Model

movable fluid composition of many components modified in many cases for communication and absorption.


everything enclosed by the plasma membrane except nucleus; contains organelles and skeletal components of cells.


Any of a number of organized or specialized structures within a living cell.

Endoplasmic Reticulum

long membranous, interconnected channels serving as transport system, skeletal support, and protein and lipid synthesis.

Rough ER

covered with ribosomes.

Smooth ER

lacks ribosomes.


found on ER and free in cytoplasm

Golgi Apparatus

stack of flattened membranous sacs; refines, packages, and delivers proteins manufactured in ER ribosomes to cell membranes or organelles.


elongated, fluid-filled sacs containing their own DNA.


tiny, membranous sacs containing powerful enzymes.


membranous sacs varying in size and contents; many contain different substances for import and export.


membranous sacs containing enzymes which catalyze a variety of biochemical reactions; most abundant in liver and kidneys.


consists of centrioles which form the spindle fibers which function in cell division.


move mucus over surface of respiratory tract.


enable sperm to swim to ovum waiting in oviduct.


are the thinnest filaments of the cytoskeleton found in the cytoplasm of all eukaryotic cells.


A microscopic tubular structure present in numbers in the cytoplasm of cells, sometimes aggregating to form more complex structures.


control center of the cell. large, usually spherical centrally-located structure. enclosed within double-layered nuclear envelope. nuclear pores allow substances to move between nucleus and cytoplasm.


small dense body largely composed of RNA and protein.


loosely coiled fibers in nucleoplasm; diffuse chromosomes.


fluid within nucleus.

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