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Life on Earth Chapt 4(4th ed)
Cell Structure and Function
61
Biology
Undergraduate 2
09/06/2006

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Term
central vacuole
Definition
a large, fluid-filled vacuole occupying most of the volume of many plant cells; performs several functions, including maintaining turgor pressure
Term
chloroplast
Definition
the organelle in plants and plantlike protists that is the site of photosynthesis; surrounded by a double membrane and containing an extensive internal membrane system that bears chlorophyll
Term
chromatin
Definition
the complex of DNA and proteins that makes up eukaryotic chromosomes
Term
cilia
Definition
short, hairlike projections from the surface of certain eukaryotic cells that contain microtubles in a 9 + 2 arrangement. The movement of cilia may propel cells through a fluid medium or move fluids over a stationary surface layer of cells
Term
cytoplasm
Definition
the material contained within the plasma membrane of a cell, exclusive of the nucleus
Term
cytoskeleton
Definition
a network of protein fibers in the cytoplasm that gives shape to a cell, holds and moves organelles, and is typically involved in cell movement
Term
eukaryotic cell
Definition
referring to cells of organisms of the domain Eukarya (plants, animals, fungi, and protists). Eukaryotic cells have genetic material enclosed within a membrane bound nucleus and contain other membrane bound organelles
Term
flagella
Definition
long hairlike extension of the plasma membrance; in eukaryotic cells, they contain microtubles arranged in a 9 +2 pattern. The movement of flagella propel some cells through cluids.
Term
golgi complex
Definition
a stack of membranous sacs, found in most eukaryotic cells, that is the site of processing and separation of membrane components and secretory materials.
Term
lysosome
Definition
a membrane bound organelle containing intracellular digestive enzymes.
Term
microtubule
Definition
a hollow, cylindrical strand, found in eukaryotic cells, that is composed of the protein tubulin; part of the cytoskeleton used in the movement of organelles, cell growth, and the construction of cilia and flagella.
Term
mitochondrion
Definition
an organelle, bounded by two membrances, that is the site of the reactions of aerobic metabolism.
Term
nuclear envelope
Definition
the double-membrance system surrounding the nucleus of eukaryotic cells; the outer membrane is typically continuous with the endoplasmic reticulum.
Term
nucleoid
Definition
the location of the genetic material in prokaryotic cells; not membrane-enclosed.
Term
nucleous
Definition
the region of the eukaryotic nucleus that is engaged in ribosome synthesis; consists of the genes encoding ribosomal RNA, newly synthesized ribosomal RNA, and ribosomal proteins.
Term
organelle
Definition
a structure, found in the cytoplasm of eukaryotic cells, that performs a specific function; sometimes refers specifically to membrane bound structures, such as the nucleus or endoplasmic reticulum.
Term
plasma membrane
Definition
the outer membrane of a cell, composed of a bilayer of phosholipids in which proteins are embedded.
Term
prokaryotic cell
Definition
cells of the domains Bacteria and Archaea. Prokaryotic cells have gentic material that is not enclosed in a membrane bound nucleus; they lack other membrane bound organelles.
Term
ribosome
Definition
an RNA molecule that can catalyze certain chemical reactions, especially those involved in the synthesis and processing of RNA itself. Manufactures many cellular proteins
Term
rough endoplasmic reticulum
Definition
endoplasmic reticulum lined on the outside with ribosomes that manufacture many cellular proteins.
Term
smooth endoplasmic reticulum
Definition
endoplasmic reticulum without ribosomes that manufactures phospholipids, cholesterol and membranes.
Term
vesicle
Definition
a small, membrane-bound sac within the cytoplasm.
Term
The outermost boundary of an animal cell is the
Definition
plasma membrane
Term
Which organelle contains a eukaryotic cell's chromosomes?
Definition
nucleus
Term
Engergy is converted to usable form (the high energy bonds of the ATP molecule) in the __________ (also extracts energy from food molecules).
Definition
mitochondria
Term
Which organelle sorts, chemically modifies, and packages newly synthzied protein?
Definition
Golgi complex
Term
Membrane enclosed organelles that contain digestive enzymes are called
Definition
lysosomes
Term
What limits cell size?
Definition
Diffusion is relatively slow so the interior of the cell must never be too far from the plasma membrane, and the plasma membrance must have a large surface area (relative to the volume of its cytoplasm) for diffusion.
Term
What regulates the movement of molecules between the nucleus and the cytoplasm?
Definition
Pores in the nuclear envelope.
Term
Where does protein sythesis occur?
Definition
Ribosomes
Term
Where are the ribosomes manufactured?
Definition
in the nucleolus
Term
What manufactures many cellular proteins?
Definition
Rough ER
Term
What does the smooth ER manufature?
Definition
phospholipids
Term
What serves as a cells digestive system?
Definition
Lysosomes
Term
What extracts energy from food molecules?
Definition
Mitochondria
Term
What regulates water and store substances?
Definition
Vacuoles
Term
what controls the passage of materials in a cell?
Definition
the nuclear envelope
Term
Ribosome components are made where?
Definition
at the Nucleolus
Term
Eukaryotic cell's DNA are in what form?
Definition
twisted linear
Term
Prokaryotic cell's DNA is in what form?
Definition
circular
Term
If each cell has a complete set of DNA how can each cell have a different function?
Definition
The nuclear envelope allows needed access to the DNA.
Term
mitosis
Definition
a type of nuclear divison, used by eukaryotic cells, in which one copy of each chromosome moves into each of two daughter nuclei; the daughter nuclei are therfore genetically identical to each other.
Term
What are the +'s and -'s from a light microscope?
Definition
+= cell is living, use lenses to bounce light of cell, wide range of images, can be stained or illuminated. -'s= can't get too small
Term
What are the +'s and -'s from a transmission electron microscope?
Definition
beams of electrons instead of light. Focused by magnetic fields. Real small, kills subject, can show inside of cell.
Term
What are the +'s and -'s from a scanning electron microscope?
Definition
bounce electrons off specimens that have been coated with metals and provide 3 dimensional images. Kills subject.
Term
What are the +'s and -'s from a florescent tissue culture microscope?
Definition
tags the proteins so you can see them move and where they so. Allows you to distinguish between different proteins.
Term
cilium move like
Definition
a rower in a boat, sweeping motion.
Term
Flagelium move
Definition
in a wave like motion (sperm is an example)
Term
the __________in a plant cell create the energy and the _________ change it into usable form.
Definition
chloroplast, mitochondrion
Term
What makes proteins?
Definition
Ribosomes
Term
What does the smooth ER make?
Definition
phospholipids, cholesterol and membranes
Term
Name the process of manufacturing proteins.
Definition
DNA-RNA-Ribosomes (ER)- Golgi complex- membrane.
Term
The Golgi complex does what?
Definition
modifies proteins.
Term
Endergonic reaction
Definition
stores energy
Term
exergonic reaction
Definition
releases energy
Term
Net exergonic=
Definition
downhill reaction
Term
Enzymes are
Definition
reusable!
Term
What helps enzymes?
Definition
slight temperature change (do not change ph as it can denature)
Term
Where are ribosomes assembled?
Definition
Nucleolus
Term
Name a electron carrier molecule other than ATP.
Definition
Nicotinamide adenine dinucleotide (NAD) and flavin adenine dinucleotide (FAD)
Term
What does the golgi add to proteins to change their structure?
Definition
sugars.
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