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Science Test on Friday 21,2011a
Science test!!!
36
Science
7th Grade
01/20/2011

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Term
Cytology
Definition
the study or science of cells
Term
Cells
Definition
are the basic structural unit of life
Term
2 Basic types of cells and the difference
Definition
Prokaryotic-contains no nucleus
Ekaryotic-contains a nucleus (eukary-you carry)
Term
The Cell Theory
Definition
-originated in 1838 by German biologist Matthias Schleiden and Theodor Schwann
Term
The Cell Theory States..
Definition
-the cell is the unit and structure and function of a living things
-cells come from other cell by cell reproduction
Term
What happened in 1665?
Definition
Robert Hooke discovered a cavity in cork view under a microscope and called a cavity a "cell".
-He didn't know the most important part was missing.
Term
What happened in 1835?
Definition
Felix Dujardin viewed living cells and observing protoplasm.
Term
What happened in 1858?
Definition
Rudolf Virchow published the observation the cells can only come from other cells.
-Plant cells produce plant cells and animal cells produce animal cells.
Term
Name all the Cell Functions
Definition
Digestion, Nutrition, Absorption, Biosythesis, Respiration, Excretion, Secretion, Response, and Reproduction
Term
Digestion
Definition
breakdown of food into simple forms to be used by the cell
Term
Nutrition
Definition
processing of food molecules to supply energy and building materials for the cell
Term
Absorption
Definition
cells take in necessary materials from the environment such as food, water, and light.
Term
Biosynthesis
Definition
cells organize absorbed substances for chemical activity of the cell.
Term
Respiration
Definition
the exchange of gases between the cell and the environment
Term
Excretion
Definition
the removal of waste materials from the cells to the environment
Term
Secretion
Definition
cells give off substances such as vitamins, minerals, and hormones that affect other cells
Term
Response
Definition
cell activity changes in response to the environment
Term
Reproduction
Definition
cells divide, producing more cells
Term
Cytoplasm
Definition
a thick clear fluid that makes up the cell material outside the nucleus
Term
Nucleus
Definition
the control center of the cell. In an animal cell, the nucleus contains the cell's genetic material.
Term
Nucleolus
Definition
structure inside the nucleus containing RNA(Ribonucleic acid)
Term
Chromatin
Definition
mass of DNA(Deoxyribonucleic acid) and proteins that form chromosomes
Term
Centrioles
Definition
used in cell reproductions
Term
Ribosomes
Definition
tiny, grainy structures attached to endoplasmic reticulum that produce proteins for the cell.
Term
Endoplasmic Reticulum (E.R)
Definition
a network of double membranes in the cytoplasm of the cell that allows materials to move through the cytoplasm
Term
Smooth ER
Definition
stores steroids and ions used by the cell
Term
Rough ER
Definition
works with ribosomes to produce and store proteins
Term
Vacuoles
Definition
fluid filled cavities found in plant cells that are used for storage of materials
Term
Mitochondria
Definition
rod-shaped structure that is the center of cell respiration and is responsible for releasing energy to support all cell functions (power plant of the cell)
Term
Golgi's Apparatus
Definition
-named for Camillo Golgi
It packages protein molecules into membranes that are sent to the cell's outer surface for export (excretion/secretion)
Term
Pectin
Definition
jelly-like substance that is the main material to form the cell wall
Term
Grana
Definition
small bodies of chlorophyll which are formed between layers of proteins and lipids
Term
Cell Membrane
Definition
outer edge of the cytoplasm that separtes the cell from other cells and surrounding fluids.
-Secretion and excretion occur through the cell membrane
Term
Cilia
Definition
Hair-like structure found on the outside of the cell which are used to move and to interact with its environment
Term
Lysosomes
Definition
rounded structures which contain enzymes used in the digestion of protein
Term
Plastid
Definition
founded in plant cells only. Plastids manufacture chemicals and store foods
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