Table of Contents
Definition
Active transport
The movement of molecules from an area of lower concentration to the area of a higher concentration, with the expenditure of energy
Definition
Cell membrane
A thin and elastic membrane covering the cytoplasm of all prokaryotic and eukaryotic cells
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Definition
Cell theory
One of the most fundamental education about cells, proposed by Schleiden and Schwann
Definition
Cell wall
The non-living and strong component of the cell, located outside the cell membrane, in plants, fungi, prokaryotes, and many protists
Definition
Centriole
The hollow and cylindrical organelles present in the cells of animals and many unicellular organisms
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Definition
Chloroplast
The green plastids found in plants and many protists; involved in photosynthesis
Definition
Chromoplast
The plastids with pigments of bright colors: are present in flower petals, fruits, etc.
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Definition
Cytoplasm
The semi-viscous and semi-transparent substance present between the plasma membrane and the nuclear envelope
Definition
Diffusion
The movement of molecules from an area of their higher concentration to the area of lower concentration
Definition
Endoplasmic reticulum
The network of channels that extends from plasma membrane to the nuclear envelope
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Definition
Epithelial tissue
Animal tissue that covers the outside of the body and lines organs and cavities
Definition
Facilitated diffusion
The movement of the molecules from higher to lower concentration with the help of transport proteins
Definition
Golgi apparatus
The set of flattened sac-like structures called cisternae; found in animal and plant cells; are involved in cell secretions
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Definition
Mitochondrion
The double membrane-bounded structure in eukaryotes; is involved in cellular respiration
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Definition
Osmosis
The movement of water molecules from a solution of lesser solute concentration to a solution of higher solute concentration, across a semi-permeable membrane
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Definition
Ribosome
Tiny granular structures in the cells; either floating freely in the cytoplasm or bound to the endoplasmic reticulum, involved in protein synthesis
Definition
Semi-permeable
The structure that allows a very few molecules to cross it and checks the majority of molecules to cross
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Definition
Tissue
Group of cells of the same type doing a particular job, e.g. the glandular tissue, muscular tissue, nervous tissue etc
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