bio exam 2 review
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- which of the following are functions of the cytoskeleton
- support, and motility
- which of the following statements is true about diffusion
- it is a passive process
- which of the following do mitochondria and chloroplasts have in common
- both have a double membrane structure
- which of the following statements about enzymes is incorrect
- enzymes generally slow reaction rates
- which of the following statements is true about passive transport
- passive transport permits the transported molecules to move in either direction, but the majority of tranport occurs down the concentration gradient of the molecule
- according to the second law of thermodynamics, which of the following is true
- the decrease in entropy associated with life must be compensated for by an increase in entropy in the environment that life occurs in
- which of the following is incorrect about the extracellular matrix
- it is present in plant and animal cells
- which one of the following is not in some way involved in facilitated diffusion
- an outside energy source
- a chemical reaction is designated as exergonic rather than endergonic when
- the products are less complex than the reactants.
- one of the functions of cholesterol in animal cell membrane is to
- maintain membrane fluidity
- imagine two solutions separated by a selectively membrane that allows water to pass, but not sucrose or glucose. The membrane separates a .2 molar sucrose solution from a .2 molar glucose solution. with time , how will the solution change
- after sucrose dissociates to two monosaccharides, water will be osmotically drawn to that side of the membrane.
- cotransport
- is active transport driven by a concentration gradient
- metabolic pathways in cells are typically far from equilibrium. Which of the following processes tend to keep these pathways away from equilibrium
- the continuous removal of the products of a pathway to be used in other reactions, and an input of free energy from outside the pathway (eg: food)
- what is the voltage across a cell membrane called
- membrane potential
- the process of stabilizing the structure of an enzyme in its active form by the binding of a molecule is an example of
- allosteric regulation
- which one of the following pairs matches the name of a membrane transport process with the primary function of that process
- pinocytosis-the uptake of water and small solutes into the cell by formation of vesicles at the plasma membrane.
- which one of the following molecules is most likely to diffuse freely across the lipid bilayer of the plasma membrane without the involvement of a transport protein
- carbon dioxide
- which of the following statements about the active site of an enzyme is correct
- the active site may resemble a groove or pocket in the surface of a protein into which the substrate fits
- which of the following would be least likely to diffuse through a plasma membrane without the help of a transport protein
- a polar molecule
- which of the following is correct about the extracellular matrix
- it contains a mixture of proteins and carbohydrates, it can transmit mechanical information to the cell's interior, contains collagen, and it is attached to the plasma membrane
- ATP
- powers most cellular work, can couple exergonic reactions to endergonic reactions, phosphorylates proteins, and is converted to ADP and Pi by an exergonic process
- which of the following statements about enzymes is true
- enzymes speed up the rate of the reaction without changing the delta-G for the reaction.
- which of the following correctly states the relationship between anabolic and catabolic pathways
- anabolic pathways synthesize more complex organix molecules using the energy derived from catabolic pathways
- which of the following processes includes all others (osmosis, diffusion of a solute across a membrane, facilitated diffusion, and transport of an ion down its electrochemical gradient)
- passive transport
- which of the following is a difference between active transport and facilitated diffusion
- active transport requires energy from ATP, and facilitated diffusion does not