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bio exam 2
practice test
| Question | Answer |
|---|---|
| lipids that form membranes have what kind of structure | polar heads and polar tails, which allows them to interact with water on both sides of the membrane |
| cooking oil and gasoline (a hydrocarbon) are NOT amphipathic molecules because they __________ | do not have a polar or charged region |
| phospholipids and triglycerides both ________ | have a glycerol backbone |
| which aspect of phospholipids is most important t the formation of bilayers? | they are amphipathic |
| a phospholipid is a ___________ | non polar lipid molecule that is made amphipathic by the addition of a phosphate |
| which of the following is a large organic molecule that is NOT assembled by polymerization of a few kinds of simple subunits? | a steroid |
| which of the following does not cross the lipid bilayers? | a sodium ion |
| which of the following is TRUE of osmosis? | water moves across a membrane from areas of lower solute concentration to areas of higher concentration |
| celery stalks that are immersed in fresh water for several hours become stiff. similar stalks left in a 0.15 M salt solution become limp. For this we can reduce that the fresh water _________ | is hypotonic and the salt solution is hypertonic to the cells of the celery stalks |
| which of the following crosses lipid bilayers? | a small, non polar molecule like oxygen |
| a patient was involved in a serious accident and lost a large quantity of blood. in an attempt to replenish body fluids, distilled water is added to veins equal to the volume of blood lost - is added directly via one of his veins. What is result | the patients red blood cells with swell and possibly burst because the blood has become hypotonic compared to the cells |
| under what circumstances does membrane transport require energy | whenever a solute is moved against its gradient |
| where would you most likely find an integral membrane protein? | spanning the cell membrane, which parts of the protein visible from both inside and outside the cell |
| which of the following types of molecules are the major structural components of the cell membrane? | phospholipids and proteins |
| for a protein to be an integral membrane protein, it would have to be _________ | amphipathic, with at least one hydrophobic region |
| all of the following are part of a prokaryotic cell except __________ A. DNA B. a cell wall C. an endoplasmic reticulum D. ribsomes | endoplasmic reticulum |
| in a bacterium we will find DNA in | the nucleoid |
| large numbers of ribosomes are present in cells that specialize in producing which of the following molecules? | proteins |
| a cell with a predominance of free ribosomes is most likely ______ | primarily producing proteins in the cytosol |
| which type of organelle or structure is primarily involved in the synthesis of oils, phospholipids, and steroids? | smooth ER |
| which organelle often takes up much of the volume of the plant cell? | vacuole |
| which organelle is the primary site of ATP synthesis in eukaryotic cell? | mitochondrion |
| which plant cell organelle contains its own DNA and ribosomes? | mitochondrion |
| thylakoids, DNA, and ribosomes are all component found in _____ | mitochondrion |
| which structure os common to plant and animal cells? | mitochondrion |
| why is the smooth ER unable to synthesize proteins? | no ribosomes are attached to its surface |
| suppose a young boy is always tired and suffering from a metabolic disease. which organelles is most likely involved in this disease? | mitochondria |
| which structure - function pair is mismatched? A. nucleolus-production of ribosomal subunits B. lysosome-intracellular digestion C. ribosome-protein synthesis D. rough ER-protein sorting | rough ER-protein sorting |
| which of the following would you NOT find in a plant cell? | collagen |
| what is a major difference between extracellular matrix of a plant cell and animal cell? | plant ECM is primarily carbohydrate in nature, whereas animal ECM is mainly proteins |
| plasmodesmata in plant cells are most similar in function to which of the following structures in animal cells? | gap junctions |
| in plant cells, the middle lamella ______ | allows adjacent cells to adhere to one another |
| plasmodesmata are cell-cell junctions that are found between ________ | adjacent plant cells |
| a cell with membrane-bound proteins that selectively bind a specific hormone is called that hormone's ______ | target cell |
| lipid-soluble signaling molecules, such as testosterone, cross membranes of cells but affect only target cells because ________- | receptors are present only in target cells |
Created by:
cierrawink