Cells Test 2 Flashcards

Terms Definitions
an educated guess
DISPROVED spontaneuos generation
francesro redi
structures that perform specific functions (jobs) within the cell
Cell wall-
supports/protects the cell Bacteria, Plant
Nuclear Envelope
a double-layered membranethat surrounds and protects the nucleus
composed of only one cell
a tiny, somewhat mitten-shaped organelle occurring in great numbers in the cell cytoplasm either freely, in small clusters, or attached to the outer surfaces of endoplasmic reticula, and functioning as the site of protein manufacture.
Cell Wall
supports and protects the cell
tiny structure where protiens are synthesized.
movement of particles or molecules from higher concentration to lower concentration
Those cells with a defined nucleus
organalles that, usinng oxygen convert neutreants into energy that can be used by the cell
oranelles that, using oxygen, convert nutrients into energy that can be used by the cell
nuclear envolope
a doubled-layer membrane that surrounds and protecs the nucleus
define Chloroplasts
photosynthetic organelles found in some cells of plants and algae
Level 2.
A group of similar cells that form a common function.
1. most plants have large central vacuoles filled with liquid 2.vacuoles are saclike structures that store materials such as water, salts, protines, and carbohydrates3.animal cells lack a large central vacuole but may contain many smaller ones
a small sac that contains digestive materials
Organisms composed of more than one cell
positive feedback
a control mechanism that intensifies or enhances an earlier reaction
sac that stores water, nutrients, and other chemicals. The large vacuole found in plant cells help maintain the cells shape
plasma membrane
a double layered membrane that surrounds the cell.also called the cell membrane,it regulates what enters and leaves the cell.
nuclear membrane
separates the nucleus from the cytoplasm
nuclear envlope
a doudle layered membrane that sorounds and protects the nucleus
small, rocky objects that mostly lie in a belt between the orbits of Mars & Jupiter
special vesicles in animal cells that contains enzymes
1. The arrangment of parts in an organism.
2. The shape of a part and the material of which the part is made
is a green pigment found in almost all plants, algae, and cyanobacteria.
a small body in the nucleus where ribosomes are synthesized.
a small structure within the cell that serves specialized functions
golgi apparatus
a stack of membranes that collects, modifies, and packages chemical compounds
Solar Eclipse
the Earth moves into the moon's shadow
center of a cell that contains the cells dna
Organ System:
a group of organs that work together (digestive system, respiratory system, circulatory system, reproductive system, and nervous system)
prokaryotic cells do not have any _____
membrane covered organelles
cell theory
states that all organisms are made up of one or more cells, the cell is the basic unit of life, and all cells come from other cells
Plasma Membrane (Cell Membrane)
controls what enters and leaves the cell
Describe the organism tree system.
Cell, tissue, organ, organ system, organism.
what are the 4 elements that all living thigs are made up of
Hydrogen, oxygen, carbon, & nitrogen
12. How does a Lysosome look like?
A Lysosome lookes like a small round strucure.
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