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HHS Life Science
exam part 1B
58
Science
7th Grade
12/22/2006

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Term
ROBERT HOOKE
Definition
the fisrt person to describe cells while looking at thin slices of cork
Term
ANTON VAN LEEUWENHOEK
Definition
a person who make his own microscopes and saw protist, bacteria, blood cells, and yeast
Term
MATTHIAS SCHLEIDEN
Definition
the scientist who concluded that all plant parts are made of cells
Term
THEODOR SCHWANN
Definition
the scientist who concluded that all animal tissues are made of cells
Term
RUDOLPH VIRCHOW
Definition
the scientist who stated that all cells could form only from other existing
Term
CELL MEMBRANE
Definition
a protective layer that covers the cell's surface and acts as a barrier. it also controls what enters and leaves the cell
Term
CYTOPLASM
Definition
a gel-like substance inside the cell
Term
ORGANELLES
Definition
structures inside a cell that perform specific functions for the cell
Term
NUCLEUS
Definition
a membrane-covered organelle that contains the cell's DNA and controls what happens inside the cell
Term
MULTICELLULAR
Definition
many-celled
Term
CELL WALL
Definition
a rigid structure that surrounds a cell to give it support
Term
CYTOSKELETON
Definition
a web of proteins in the cytoplasm that keeps the cell membrane from collapsing and can help with movement
Term
RIBOSOMES
Definition
organelles that make proteins
Term
ENDOPLASMIC RETICULUM
Definition
a system of membranes in a cell's cytoplasm that transports proteins and produces lipids
Term
MITOCHONDRION
Definition
an organelle that breaks down sugar to release energy
Term
CHLOROPLASTS
Definition
organelles in plant cells where photosynthesis happens
Term
PHOTOSYNTHESIS
Definition
the process where plants and algae use sunlight, carbon dioxide, and water to make oxygen and sugar
Term
CHLOROPHYLL
Definition
a green pigment that is found inside chloroplasts that traps the energy from sunlight
Term
GOLGI COMPLEX
Definition
an organelle that helps make and package materials that will be moved out of the cell
Term
VESICLE
Definition
a small sac that surrounds materials to be moves into or out of the cell
Term
LYSOSOME
Definition
an organelle that contains digestive enzymes that destroy worn out or damaged organelles, gets rid of wastes, and protects the cell from foreign materials (these are mainly found in animal cells)
Term
VACUOLE
Definition
an organelle that stores materials in a cell
Term
TISSUE
Definition
a group of cells that work together to do a specific job
Term
ORGAN
Definition
a collection of tissues that carry out a specialied function
Term
ORGAN SYSTEM
Definition
a group of organs working together to do a specific job
Term
UNICELLULAR
Definition
onganism made of just 1 cell
Term
STRUCTURE
Definition
the arrangement of parts in an organism
Term
FUNCTION
Definition
the job a specific part does
Term
DIFFUSION
Definition
the movement of particles from areas of high concentration to areas of low concentration
Term
OSMOSIS
Definition
the diffusion of water through a semipermeable membrane
Term
SEMIPERMEABLE
Definition
when only certain substances are allowed to pass through
Term
PASSIVE TRANSPORT
Definition
the movement of particles across a cell membrane without the use of energy by the cell
Term
ACTIVE TRANSPORT
Definition
the movement of substances that requires the cell to use energy
Term
ENDOCYTOSIS
Definition
a type of active transport where a cell surrounds a particle and brings it into a cell
Term
EXOCYTOSIS
Definition
an active transport process where particles leave the cell
Term
CELLULAR RESPIRATION
Definition
the process where cells use oxygen to break down food to release energy
Term
FERMENTATION
Definition
the process where cells break down food and release energy without using oxygen
Term
LACTIC ACID
Definition
a substance produced in fermentation that makes muscles burn and feel stiff and sore
Term
CELL CYCLE
Definition
the life cycle of a cell
Term
CHROMOSOMES
Definition
structures that are made up of DNA in a cell
Term
BINARY FISSION
Definition
splitting into two parts
Term
INTERPHASE
Definition
the stage of the cell cycle where a cell grows and copies its organelles and chromosomes
Term
MITOSIS
Definition
the process of chromosome separation
Term
CYTOKINESIS
Definition
the division of cytoplasm
Term
List the 3 parts of cell theory
Definition
1-all organisms are made of 1 or more cells 2-the cell is the basic unit of all living things 3-all cells come from existion cells
Term
List and describe 2 basic types of cells
Definition
Prokaryotic-cell that have NO nucleus Eukaryotic-cells that have a nucleus
Term
What are 3 benefits of being multicellular?
Definition
1-larger size 2-longer life 3-more specilization
Term
What happens in photosynthesis?
Definition
the process that plants, algae, and some bacteria use to make glucose (sugar) and oxygen from sunlight, carbon dioxide and water
Term
Where does photosynthesis happen?
Definition
in choloplasts
Term
What happens in cellular respiration?
Definition
glucose and oxygen combine to release carbon dioxide, water, and energy
Term
Where does cellular respiration happen?
Definition
in the mitochondria of eukaryotic cells or in the cell membrane of prokaryotic cells
Term
What are the 3 stages in the eukaryotic cell cycle?
Definition
1-interphase 2-mitosis 3-cell separation
Term
What are the phases of mitosis?
Definition
1-prophase 2-metaphase 3-anaphase 4-telophase
Term
What happens in prophase?
Definition
the nuclear membrane disappears, the chromosomes condense into rodlike structures
Term
What happens in metaphase?
Definition
chromosomes line up across the middle of a cell, homologous chromosomes pair up
Term
What happens in anaphase?
Definition
chromosomes separate, chromosomes move to opposits sides of the cell
Term
What happens in telophase?
Definition
the nuclear membrane forms around each set of chromosomes, chromosomes unwind
Term
What happens in cytokinesis?
Definition
the cell membrane pinches in, to form two new daughter cells
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