| A | B |
|---|
| The smallest units of life in all living things | cells |
| When the volume of a cell increases, its suface area | increases at a slower rate |
| Surface area is an important factor in limiting cell growth because | the cell may become too large to take in enough food and to remove enough wastes |
| The size to which a cell can grow is limited by its | surface area |
| A cell that can change its shape would be well suited for | moving to different tissues through narrow openings |
| One difference between prokaryotes and eukaryotes is that | prokaryotes have no nuclear membrane |
| Did prokaryotes exist on Earth before or after eukaryotes? | Before |
| What is an example of a prokaryotic cell? | a bacterium |
| Only eukaryotic cells have | membrane-bound organelles |
| Studying a picture of a cell taken with an electron miscrope, you find that the cell has no nucleus and no mitochondria, but it does have a plasma membrane & a cell wall. The cell is probably from a | prokaryote |
| Plasma membranes | are thin coverings that surround cells |
| The structure that regulates what enters & leaves the cell is the | plasma membrane |
| What encloses the contents of a cell | plasma membrane |
| The plasma membrane is selectively permeable because | it allows the passage of some solutes & not others |
| A structure within a cell that performs a specific function is an | organelle |
| A particularly active cell might contain large numbers of | mitochondria |
| What receives proteins and lipids from the endoplasmic reticulum? | Golgi apparatus |
| What labels the molecules made in the endoplasmic reticulum with tags that specify their destination? | Golgi apparatus |
| What releases molecules in vesicles? | Golgi apparatus |
| Proteins are made on the | ribosomes |
| One important organelle that helps maintain homeostasis by moving supplies from one part of the cell to the other is the | endoplasmic reticulum |
| A cell's ATP is produced in the | mitochondrion |
| Numerous hairlike organelles that protrude from the sruface of a cell and are packed in tight rows are called | cilia |
| The packaging & distribution center of the cell is the | Golgi apparatus |
| The double membrane surrounding the nucleus is called the | nuclear envelope |
| The covering that surrounds all cells & controls what information & materials enter & leave it is the | plasma membrane |
| A cell's genes is contained in | either a central zone or a nucleus |
| The internal fluid does what 2 things? | 1)gives shape to all cells and 2)supports the other things within cell |
| Cell:plasma membrane:: | nucleus:nuclear envelope |
| Animal cells do not have a | cell wall |
| Plant cells have a | cell wall |
| Chloroplasts & mitochondria both contain | DNA |
| The organelles associated with photosynthesis are | chloroplasts |
| The organelles in plant cells that contain a green pigment are the | chloroplasts |
| What is the large membrane-bound space in plant cells in which water, waste products, & nutrients are stored? | central vacuole |
| Do animal cells have a cell wall? | No |
| Plant cells have | Chloroplasts & a cell wall |
| The order of organization in living things from simplest to most complex is | cells, tissues, organs, organ systems |
| The statement "Cells are produced only from existing cells" is part of the | Cell Theory |
| The ratio of surface area to volume put limitations on | a cell's size |
| What cells are much larger & have more specialized functions because they contain organelles? | Eukaryotic cells |
| What cary out specialized activities in cells? | organelles |
| A cell with a well-defined nucleus & sytoplasm surrounded by a plasma membrane is an | Eukaryotic cell |
| What type of molecules have "heads" & "tails" and are found in the plasma membrane? | Phospholipids |
| Teh spherical organelles that are the site of protein synthesis in a cell are the | ribosomes |
| The meshlike network of protein fibers that support the shape of the cell is called the | cytoskeleton |
| The fluid part of the cytoplasm is called the | cytosol |
| This takes place in the chloroplast of plant cells | Photosynthesis |
| Both plant and animal cells have | plasma membranes |
| Plant cells are also surrounded by a | cell wall |
