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30 Cards in this Set
- Front
- Back
Light microscopes
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use light and glass lenses to magnify an image.
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A scanning electron microscope is used to study __________, whereas a transmission electron microscope is used to study __________.
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cell surfaces . . . internal cell structures
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Which of the following statements is consistent with the Cell Theory?
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The cell is the basic structural and functional unity of life.
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We can characterize the fluid mosaic model of a membrane as ____________ floating in a sea of ___________
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proteins; lipid
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Large, round cells can overcome surface area to volume problems by
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becoming smaller, narrower or flatter.
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As cell size increases, the
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volume increases faster than the surface area.
v^3 sa^2 |
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Cells that lack a membrane-bound nucleus are __________ cells.
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prokaryotic
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The membranous compartmentalization of a cell
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allows different metabolic processes to occur simultaneously.
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If a biologist said that eukaryotic cells get their power from bacteria, they would be referring to
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the mitochondria in our cells that may have originated as endosymbiotic bacteria.
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Long fibers of DNA and protein are called a
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chromatin
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Smooth endoplasmic reticulum
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stores calcium ions in muscle cells.
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Secretory proteins are
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released from the cell through the plasma membrane.
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The Golgi apparatus
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stores, modifies, and packages proteins.
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Lysosomes
help to digest worn-out or damaged organelles. recycle materials within the cell. fuse with food vacuoles to expose nutrients to lysosomal enzymes. destroy harmful bacteria engulfed by white blood cells. |
all)
help to digest worn-out or damaged organelles. recycle materials within the cell. fuse with food vacuoles to expose nutrients to lysosomal enzymes. destroy harmful bacteria engulfed by white blood cells. |
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Contractile vacuoles
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prevent cells from bursting as a result of the influx of excess water.
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Cilia differ from flagella in that
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cilia are typically more numerous and shorter than flagella.
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Plants with rigid cell walls are unable to do which process?
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phagoctyosis
process by which certain living cells called phagocytes ingest or engulf other cells or particles |
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Which of the following cell structures is not associated with the breakdown of harmful substances or substances that are no longer needed by the cell?
lysosomes mitochondria peroxisomes vacuoles |
mitochondria
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Small, nonpolar, hydrophobic molecules such as fatty acids
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easily pass through a membrane's lipid bilayer.
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Membrane phospholipids
have hydrophobic heads that face the center of the membrane and are shielded from water. have hydrophilic tails that face outward and are exposed to water. often have "kinks" in their tails caused by the presence of a single rather than a double bond between carbons. remain fluid because they are tightly packed against one another. None of the choices are correct. |
None of the choices are correct.
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Which one of the following is not a function of membrane proteins?
serve as enzymes. attach the membrane to the cytoskeleton. provide cellular identification tags. form junctions between cells. All of the choices are membrane protein functions. |
All
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Diffusion does not require the cell to expend ATP. Therefore, diffusion is considered a type of
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passive transport.
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If you were to transfer a saltwater, single-celled protist to fresh water, which of the following is likely to happen?
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The cell will swell and burst
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Osmosis can be defined as
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the diffusion of water across a membrane.
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If you were to transfer a freshwater, single-celled protist to saltwater, which of the following is likely to happen?
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The cell will shrink.
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Which of the following statements is true?
Cells placed in an isotonic solution will swell. Cells placed in a hypotonic solution will swell. Cells placed in a hypotonic solution will shrink. Cells placed in a hypotonic solution will remain the same size. |
Cells placed in a hypotonic solution will swell.
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A cell that has neither a net gain nor a net lose of water when it is immersed in a solution is
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isotonic to its environment
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Active transport
uses ATP as an energy source. can move solutes up a concentration gradient. requires the cell to expend energy. is necessary to allow nerves to function properly. All of the choices are correct. |
all
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The act of a white blood cell engulfing a bacterium is
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phagocytosis
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Phagocytosis is to eating as pinocytosis is to
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drinking
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