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organelles
vocab
15
Biology
12th Grade
12/14/2008

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Term
nucleus
Definition
The nuclear envelope is the double membrane that encloses the nucleus, it has pores and is contiguous with the ER. The nucleolus is a highly concentrated area of DNA that produces the ribosomes. Chromatin is the material surrounding the nucleolus that is made up of proteins and DNA. All three of these parts make up the nucleus.
Term
centrosome
Definition
part of the cell where the microtubules originate
Term
golgi apparatus
Definition
modifies and packages proteins and lipids into vesicles which often migrate to the plasma membrane.
Term
mitochondria
Definition
responsible for cellular respiration and ATP production from carbohydrates
Term
Peroxisome
Definition
break down various substances like hydrogen peroxide, fatty acids, and amino acids; also it has various metabolic functions
Term
plasma membrane
Definition
phospholipid bilayer enclosing the cell; it separates the internal metabolic reactions from the external environment and it controls the transport of materials into and out of the cell
Term
cell wALL
Definition
provide support for the cell, maintains cell’s shape, and protects the cell from damage
Term
Plasomodesmata
Definition
channels through the cell wall that connect the cytoplasm to adjacent plant cells
Term
chloroplasts
Definition
carries out photosynthesis in a plant cell, which converts sunlight into energy for the cell in sugar molecules
Term
central vacuole
Definition
place in cell used for storage, breakdown of waste, and hydrolysis of macromolecules; it’s enlargement is a mechanism in plant growth; maintains rigidity in the cell and organism
Term
tonoplast
Definition
membrane enclosing the central vacuole
Term
rough ER
Definition
creates glycoproteins by attaching polysaccharides to polypeptides as they are assembled by the ribosomes connected to it
Term
smooth ER
Definition
active in synthesis of lipids and hormones; breakdown of toxins
Term
cytoskeleton
Definition
reinforces cell’s shape and helps in cell movement
Term
ribosomes
Definition
in the cytoplasm they assist in the assembly of amino acids and proteins; on Rough ER they assist in assembling glycoproteins
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