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The Cell in Action II
Regular
25
Science
7th Grade
01/18/2011

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Term
Osmosis
Definition
The diffusion of water through a semipermeable membrane
Term
Passive transport
Definition
The movement of substances across a cell membrane without the use of energy by the cell
Term
Active transport
Definition
The movement of substances across the cell membrane that requires the cell to use energy
Term
Endocytosis
Definition
the process by which a cell membrane surrourds a particle and encloses the particle in a vesicle to bring the particle into the cell
Term
Exocytosis
Definition
The process in which a cell releases a particle by enclosing the particle in a vesicle that then moves to the cell surface and fuses with the cell membrane
Term
Photosynthesis
Definition
The process by which plants, algae, and some bacteria use sunlight, carbon dioxide, and water to make food
Term
Pigments
Definition
Term
Chlorophyll
Definition
Term
Diffusion
Definition
The movement of particles from regions of higher density to regions of lower density
Term
Cellular respiration
Definition
The process by which cells use oxygen to produce energy from food
Term
Fermintation
Definition
The breakdown of food without the use of oxygen
Term
Name two types of fermintation
Definition
1. When muscles cells can't get the oxygen needed for cellular respiration,this produces lactic acid. The buildup of lactic acid contributes to muscle fatigue and burning sensation

2. Yeast forms carbon dioxide bubbles, causing the bread dough to rise and leave small holes in bread after it is baked.
Term
Lactic acid
Definition
Term
Mitosis
Definition
in eukaryotic cells, a process of cell division that forms two new nuclei, each which has the same number of chromosomes
Term
What does mitosis produce
Definition
two new nucllei, each which has the same number of chromosomes
Term
Cytokinesis
Definition
the division of the cytoplasm of a cell
Term
Interphase
Definition
The first state of eukaryotic cell cycle, in which the cell grows and copies its organelles and chromosomes
Term
Homologous chromosomes
Definition
chromosomes that have the same sequence of genes and the same structure, such as, the 46 chromosomes of a human body
Term
Why do cells need energy
Definition
Term
Chromosomes
Definition
In a eukaryotic cell, one of the structures in the nucleus that are made up of DNA and protein; in a prokaryotic cell, the main ring of DNA
Term
Chromatids
Definition
First stage of eukaryotic cell cycle, when each chromosome is duplicated, in which the copies are called
Term
Centromeres
Definition
First eukaryotic cell cycle, where the chromatids are hold together by
Term
Daughter cells
Definition
Term
Why must a cell copy its DNA
Definition
Term
How many chromosomes do humans have?
How many pairs?
Definition
46 chromosomes
23 pairs
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