Question 10 Ionic molecules (ie. Na$^+$, K$^+$) can diffuse straight through the plasma membrane. O True O False 1.54 pts
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Step 1: The plasma membrane is a selectively permeable membrane, meaning that it only allows certain substances to pass through it. Show more…
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Material can move selectively from the inside to the outside of the cells, and from the outside to the inside, across the plasma membrane: True False
Adi S.
QUESTION 35 The direction that most accurately describes secretory protein movement through the endomembrane system would be A. rough endoplasmic reticulum→vesicles→ Golgi apparatus→vesicles →plasma membrane B. plasmid→plasma membrane→nuclear envelope→smooth endoplasmic reticulum→vesicles C. nuclear envelope→vesicles→Golgi apparatus→rough endoplasmic reticulum→plasma membrane D. Golgi apparatus→smooth endoplasmic reticulum →lysosome→vesicles→plasma membrane QUESTION 36 What is the difference between osmosis and diffusion? A. Osmosis moves materials from low to high concentration, diffusion does the opposite. B. There is no difference between osmosis and diffusion. C. Osmosis moves materials from high to low concentration, diffusion does the opposite. D. Osmosis involves the movement of water; diffusion involves the movement of a solute. QUESTION 37 Five ATP molecules can theoretically cause how many Na+ and K+ to move across the membrane? A. 15 Na+ in and 10 K+ out B. 15 Na+ out and 10 K+ in C. 15 K+ in and 10 Na+ out D. 15 K+ out and 10 Na+ in QUESTION 38 A patient has had a serious accident and lost a lot of blood. In an attempt to replenish body fluids, distilled water, equal to the volume of blood lost, is transferred directly into one of his veins. What will be the most probable result of this transfusion? A. The patient's red blood cells will burst because the blood fluid is hypertonic compared to the cells. B. The patient's red blood cells will swell because the blood fluid is hypotonic compared to the cells. C. The patient's red blood cells will crenate because the blood fluid is hypotonic compared to the cells. D. The patient's red blood cells will crenate because the blood fluid is hypertonic compared to the cells. QUESTION 39 Turgor pressure is observed when a plant cell's environment is hypotonic. True False QUESTION 40 Cilia are different from flagella in that the cilia are shorter and less numerous. True False QUESTION 41 Cellular membranes are mosaic and symmetrical. True False QUESTION 42 Which of the following organelle(s) is(are) most likely to be able to divide and reproduce much like a cell does? A. mitochondria, chloroplasts, and lysosomes B. chloroplasts only C. mitochondria only D. both mitochondria and chloroplasts QUESTION 43 Metabolic reactions fall under two general categories: anabolic and catabolic. What type of chemical reactions are these two classes of metabolic reactions? A. Anabolic reactions are exergonic reactions, whereas catabolic reactions are endergonic. B. Anabolic reactions are endergonic reactions, whereas catabolic reactions are exergonic. C. Both anabolic and catabolic reactions are exergonic. D. Both anabolic and catabolic reactions are endergonic. QUESTION 44 In order for a protein to be an integral membrane protein it would have to be which of the following? A. amphipathic B. hydrophilic C. exposed on only one surface of the membrane D. hydrophobic QUESTION 45 Water passes quickly through cell membranes because A. water movement is tied to ATP hydrolysis. B. the bilayer is hydrophilic. C. it moves through aquaporins in the membrane. D. it is a small, polar, charged molecule.
Josee P.
What kinds of molecules would you likely find in the region indicated by the arrow? Hydrophilic molecules Hydrophobic molecules Both hydrophilic and hydrophobic molecules Not enough information to answer this question Assuming a molecule could freely pass through the membrane via simple diffusion, in order for there to be net movement of a molecule in one direction, there would need to be a concentration gradient in place. True False
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