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55 Cards in this Set
- Front
- Back
Which of the following statements best describes the fluid mosaic model of the plasma membrane? |
a lipid bilayer with protein molecules dispersed within it |
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Which item below is NOT a function or role performed by proteins found in the plasma membrane? |
synthesis of proteins |
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In which stage of mitosis do the chromosomes align along the cell equator? |
metaphase |
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Lysosomes perform which of the following cellular functions? |
intracellular digestion |
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Which of the following organelles produces secretory vesicles? |
golgi apparatus |
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Which type of membrane transport process uses ATP as a source of energy? |
primary active transport |
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Which of the following organelle maintains cell shape, supports cellular structures, and generates cell movements? |
cytoskeleton |
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Which of the following organelles is responsible for generating most of the energy the cell uses to perform work? |
mitochondrion |
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Which of the following organelles possesses oxidase enzymes that function in neutralizing harmful free radicals? |
peroxisome |
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Which of the following organelles serves as the site of protein synthesis? |
ribosome |
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Which of the following molecular components of the lipid bilayer of the plasma membrane possesses a charged polar "phosphate" head and uncharged nonpolar fatty acid "tails"? |
phospholipid |
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Which nucleic acid molecules are involved in transcription but not translation in the synthesis of a particular polypeptide? |
DNA |
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The mRNA start codon, AUG, matches up with a tRNA anticodon, |
UAC |
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Which of the following cell structures are involved in propelling substances across cell surfaces? |
cilia |
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Which of the following cell structures is the largest organelle in the cell and functions as the control center of the cell? |
nucleus |
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Which of the following is the correct sequence for the stages of mitosis? |
prophase, metaphase, anaphase, telophase |
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Which of the following transport mechanisms specifically involves the movement of water? |
osmosis |
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Cells may said to be "sugar-coated" because of the presence of |
glycocalyx |
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Proteins in the cell membrane that bind hormones and relay messages into the interior of the cell |
perform a function known as signal transduction |
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Definite changes in the ___________ of the cell membrane can be seen in a cell that is becoming cancerous |
glyococalyx |
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All of the following cells are considered "footloose", as they lack cellular junctions, EXCEPT |
epithelial cells |
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Which of the following are considered anchoring junctions? |
desmosomes |
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Simple diffusion is best described as substances |
moving passively down a concentration gradient |
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Crenation takes places when a cell is placed in a(n) |
hypertonic solution |
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Vesicular transport is involved in all of the following transport processes EXCEPT |
solute pumps |
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The resting membrane potential is mainly determined by |
the differential permeability of the plasma membrane to K+ and other ions |
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All of the following are functions of membrane receptors EXCEPT |
cell adhesion |
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Cristae are found in which of the following cell organelles? |
the mitochondria |
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The underlying cause of Tay-Sachs disease is |
the lack of the enzymes needed to break down a glycolipid abundant in nerve cell membranes |
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Which of the following types of RNA contains regions that act as a switch to turn protein synthesis on and off for the protein they code for? |
riboswitches |
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The basic structural and functional unit of living organisms is the |
cell |
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The outer boundary of a human cell is the |
plasma membrane |
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Which of the following would NOT be found in the plasma membrane of a human cell? |
RNA |
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Tight junctions |
prevent molecules from passing through the extracellular space between adjacent cells |
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Desmosomes |
anchor junctions found in areas subjected to pulling forces |
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Gap junctions |
important for cell communication |
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Water can pass via osmosis through the lipid bilayer |
true |
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Osmosis is |
the diffusion of water across a semi-permeable membrane |
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Which of the following is a correct match regarding active/passive transport processes? |
exocytosis: active membrane transport process |
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A cell will swell, and likely burst, if it is placed in __________ solution |
a hypotonic |
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Primary active transport is driven by secondary active transport |
false |
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Pinocytosis is a type of |
endocytosis |
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Cells of the body mainly use _________ for the selective endocytosis of most macromolecules |
receptor-mediated endocytosis |
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At rest, the plasma membranes of most body cells are NOT polarized |
false |
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The primary site of cellular ATP production in most cells is the |
mitochondrion |
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Ribosomes are found |
in the cytosol and on the rough endoplasmic reticulum |
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Ribosome |
synthesizes proteins |
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Nucleolus |
synthesizes ribosomes |
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Endoplasmic reticulum |
fold, package, and modify proteins |
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Peroxisomes |
neutralize dangerous free radicals |
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Cytoskeleton |
support cellular structures |
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Lysosomes |
contain digestive enzymes |
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DNA is replicated during the __________ phase of the cell cycle |
S |
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A gene is best defined as |
a segment of DNA that carries out instructions for the production of one polypeptide chain |
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During transcription, |
DNA is used as a template to make RNA |