LOOK AT QUESTIONS BEFORE CONTACTING

LOOK AT QUESTIONS BEFORE CONTACTING

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Chapter 6: Cell Energy, Transport and Enzymes

1) Many of the enzymes that control a deep-sea firefly squid’s ability to produce light energy from chemical energy are located A) in membranes. B) in the nucleus. C) within chloroplasts. D) outside of cells. E) within mitochondria. 2) The fluid mosaic model describes the plasma membrane as consisting of A) a phospholipid bilayer with embedded carbohydrates. B) two layers of phospholipids with protein sandwiched between them. C) a protein bilayer with embedded phospholipids. D) carbohydrates, proteins, and phospholipids that can drift in the membrane. E) individual proteins and phospholipids that can drift in a phospholipid bilayer. 3) Membrane phospholipids A) have hydrophobic heads that face the center of the membrane and are shielded from water. B) have hydrophilic tails that face outward and are exposed to water. C) often have “kinks” in their tails caused by the presence of a double bond between carbons. D) remain fluid because they are tightly packed against one another. E) form impermeable layers for cells. 4) The cholesterol associated with animal cell membranes A) is attached to membrane proteins and extends into the watery environment surrounding the cell. B) helps to stabilize the cell membrane at body temperature. C) makes the cell membrane fluid at room temperature. D) is an abnormality resulting from a diet high in cholesterol. E) helps solidify the membranes when the room temperature is below freezing. 5) A major function of glycoproteins and glycolipids in the cell membrane is to A) glue cells together to form tissues. B) allow the cells of an embryo to sort themselves into tissues and organs. C) attach the cell membrane to the cytoskeleton. D) help the cell resist swelling. E) help the cell retain its shape. 6) When physicians perform an organ transplant, they choose a donor whose tissues match those of the recipient as closely as possible. Which of the following cell components are being matched? A) plasma membrane phospholipids B) plasma membrane proteins C) cell-surface carbohydrates D) plasma membrane cholesterols E) cytoskeletal elements 7) Most of the functions of a cell membrane are performed by A) glycolipids. B) proteins. C) phospholipids. D) cholesterol. E) nucleotides.

BSC1005 Biology General Chapter 6

LOOK AT QUESTIONS BEFORE CONTACTING

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9) Relaying a message from a membrane receptor to a molecule that performs a specific function within a cell is called A) signal transduction. B) inhibition. C) competition. D) self-recognition. E) selective permeability. 10) Plasma membranes are selectively permeable. This means that A) anything can pass into or out of a cell as long as the membrane is intact and the cell is healthy. B) the plasma membrane allows some substances to enter or leave a cell more easily than others. C) glucose cannot enter the cell. D) cholesterol cannot enter the cell. E) plasma membranes must be very thick. 12) Small, nonpolar, hydrophobic molecules such as fatty acids A) easily pass through a membrane’s lipid bilayer. B) very slowly diffuse through a membrane’s lipid bilayer. C) require transport proteins to pass through a membrane’s lipid bilayer. D) are actively transported across cell membranes. E) usually enter the cell via endocytosis. 13) Which characteristic promoted the utilization of lipids as the first cell membrane? A) spontaneous degradation of the intracellular environment B) self-assembly into a simple membrane C) ability to form an impermeable membrane D) formation of a semi-solid membrane E) utilization of the hydrophilic nature of lipids 14) All cells are enclosed by a plasma membrane that is similar in ________ and ________. A) thickness . . . composition B) permeability . . . content C) proteins . . . lipids D) lucidity . . . texture E) structure . . . function 15) Which of the following substances would have the most trouble crossing a biological membrane by diffusing through the lipid bilayer? A) H2O B) O2 C) CO2 D) Na+ E) a small, nonpolar molecule such as butane (C4H10) 16) Oxygen crosses a plasma membrane by A) osmosis. B) phagocytosis. C) active transport. D) pinocytosis. E) passive transport. 17) Which of the following statements regarding diffusion is false? A) Diffusion is a result of the kinetic energy of atoms and molecules. B) Diffusion is driven by concentration gradients.

LOOK AT QUESTIONS BEFORE CONTACTING

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