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21 Cards in this Set
- Front
- Back
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What is a microtubule?
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A hollow rod of tubulin protien in the cytoplasm of all eukaryotic cells and in cilia, flagella and the cytoskeleton.
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What is a contractile vacuole?
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A membranous sac that helps move excess water out of the cell.
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What is a plasma membrane?
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A selective barrier, thereby regulating the cell's chemical composition
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What is are centrioles?
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A structure in an animal cell composed of cylinders of microtubule triplets arranged in a 9 + 0 pattern; aide in cell division
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What is a nucleiod?
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A dense region of DNA in a prokaryotic cell
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What is a golgi apparatus?
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Consists of stacks of flat membranous sacs that modify, store, and route products of the endoplasmic reticulum.
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What is a gap junction?
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A type of intercellular junction in animal cells that allows the passage of material or current between cells.
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What is a mitochondrion?
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An organellevin eurkaryotic cells that serves as the site of cellular respiration
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What is a ribosome?
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Constructed in the nucleolus and functioning as the site of protein synthesis in the cytoplasm.
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What is a lysosome?
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contains digestive enzymes; low pH; involved in autophagy
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What is a rough endoplasmic reticulum?
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modifies proteins by adding carbohydrate chains
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What is a flagellum?
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A long cellular appendage specialized for locomotion.
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what is a nucleolus?
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A specialized structure in the nucleus; active in the synthesis of ribsomes.
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what is a plastid?
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includes chloroplasts, chromoplasts and amyloplasts
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what is a smooth endoplasmic reticulum?
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synthesizes lipids, steroids and phospholipids.
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What are surface appendages that allow a bacterium to stick to a surface?
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pili
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what cell junctions form a barrier to the passage of material?
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tight junctions
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the ______ is composed of DNA and protein.
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Chromatin
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what process result(s) from the presence of proteins in or on the plasma membrane?
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. cell-cell recognition
. intercellular joining . cell-cell communication |
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Which of the following molecules is most likely to diffuse freely across the lipid bilayer of the plasma membrane without the involement of a transport protien?
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CO2
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What enables a cell to pick up and concentrate a specific kind of molecule?
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receptor-mediate endocytosis
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