Cooking Oil And Gasoline (A Hydrocarbon) Are Not Amphipathic Molecules Because They

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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

Cooking Oil And Gasoline (A Hydrocarbon) Are Not Amphipathic Molecules Because They

Source: https://www.studystack.com/flashcard-2625989

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