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ap chap 3
chapter 3 cells
| Question | Answer |
|---|---|
| red blood cell placed in pure water would ___ | swell and burst |
| which of the following is not a subcellular structure | intercellular material |
| which of these is not a function of the plasma membrane | it prevents potassium ions from leaking out and sodium ions from crossing into the cell |
| extracellular matrix is | the most abundant extracellular material |
| if a tRNA had a AGC anticodon it could attach to an___mRNA codon | UCG |
| which of the following does not serve as a signal for cell division? | repressor genes |
| crenation is likeely to occur in blood cells in | a hypertonic solution |
| which of the following statments is correct regarding RNA? | messenger RNA transfer RNA and ribosomal RNA play a role in protein synthesis |
| riboswithces are folded RNA that act as switches to turn protein synthesis on or off in response to____ | changes in the enviroment |
| a gene can best be defined as___ | a segment of dna that carries the instructions for one polypeptide chain |
| which of the following is nota factor that binds cells together? | glycolipids in the glycocalyx |
| lysomes___ | contain acid hydrolasses that are potentially dangerous to the cell |
| which of these is an inclusion not an organelle? | melanin |
| which of the following describes the plasma membrane? | the phospholipid bilayer surronding the cell |
| which statment is the most correct regarding transcription/translation | the nucleotide sequence in a tRNA anticodon is an exact copy of he DNA triplet that ocded for it except that uracil is substituted for thymine. |
| in the maintenance of the cell resting membrane potential___> | extracellular sodium levels are high |
| in certain kinds of muscle cells, calcium ions are stored in ____. | the smooth ER |
| the functions of centrioles include____ | organizing the miotic spindle in cell division |
| mitosis | produces nucleus repliation |
| which of the following statments is correct regarding diffusion? | the greater the concetration of gradient the faster the rate of diffusion |
| passive membrane transport processes include____. | movment of a substance down its concentration gradient |
| some hormones enter cells via | receptor mediated endocytosis |
| once solid material is phagocytized and taken into a vacuole which of the following statements best describes what happens? | a lysome combines with the vacuole and digest s the enclosed solid material. |
| enzymes called___ destroy the cells DNA and cytoskeleton producing a quick death of the cell | caspases |
| the electon microscope has revealed that one of the components within the cell consists of microtubules arranged to form a hollow tube. this structure is a | centriole |
| the main component of the cytosol is____ | water |
| if cells are placed in a hypertonic solution containing a solute to which the membrane is impermeable what could happen? | the cells will lose water and shrink |
| which of the following is a concept of the cell thory? | a cell is the casic structural and functional unit of living organisims. |
| the endomembrane system is___. | the interactive system of organelles whose membranes are physically or functionally connected |
| which of the following is a principle of the fluid mosaic model of cell membrane structure? | phospholipids form a bilayer that is largly impermeavle to water-soluble molecules |
| mitochondria_____ | contain some of the dna and rna code necessary for their own function |
| which statment best describes transcytosis | transporting an endosome from one side of a cell to the other and releasing the contents by exocytosis |
| ribosomes endoplasmic reticulum and the golgi apparatus functionally act in sequence to synthesize and modify proteins for secretory use only never for use by the cell, this statement is ___. | false integral cell membrane proteins are also synthesized this way. |
| DNA replication | takes place during interphase of the cell cycle |
| cell junctions that promote th coordinated activity of cells by physically binding them together into a cell community include all of the following except____ | peroxisomes |
| caveolae are closely associated with all but which of the following | enzymes involved in cell metabolism |
| th RNA responsible for bringing the amino acids tothe facotry site for prtein formation is____. | tRNA |
| which structures are fingerlike projections that greatly increase the absorbing suface of cells? | microvilli |
| which of the following is a function of a plasma membrane protein? | molecular transport through the membrane |
| which transport process is the main mechanism for the movement of most macromolecules by body cells | receptor mediated endocytosis |
| which ofthe following would not be a constituent of a plasma membrane | messenger RNA |
| peroxisomes | are able to detoxify substances by enzymatic action |
| which of the following statments is most correct regarding the intracellular chemical signals known as second messengers | cyclic AMP and caldium may be second messengers |
| if the nucleotide or base sequence of the dna strand used as a template for messenger RNA sythesis is ACGTT then what would be the sequence of bases in the corresponding mRNA? | UGCAA |
| which of the following is true regarding the gereration of membrane potential? | both potassium and sodium ions can leak through the cell membrane due to diffusion |
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