13) 13) What would happen if activation energy barriers didn\'t exist? A) Substr

Question

13) 13) What would happen if activation energy barriers didn't exist? A) Substrates would not bind properly to enzymes B) Coenzymes would not work, but enzynse function would not be affected. C) Chemical reactions in the body would never occur D) All chemical reactions in the body would proceed whether they were needed or not 14) Imagine a balloon is made from a membrane that's permeable to water but not sucrose molecules.4) How would the balloon be affected if it is filled with a 50% sucrose solution and then placed in a beaker of water? A) The balloon would get larger as it gains water B) The balloon would not change in size or volume. C) The balloon would eventually burst D) The balkoon would get smaller as it loses water 15) If necessary, our muscles can rely upon an anaerobic (fermentative) pathway to metabolize glucose, 15) but this can only last a short period of time. Why can't our cells survive very long under such anaerobic conditions? A) Fermentation doesn't extract enough ATP from glucose to sustain our energy-craving cells. B) Lactic acid causes the cell to die when it's exposed to even lower concentrations. D) The ethyl alcohol that builds up in muscles as a result of fermentation is a toxin. 16) Elodea is a freshwater aquatic plant that is often used as aquarium vegetation. How would an C) Anaerobic conditions create a "carbon dioxide debt" that must be repaid before cells die. 16) Elodea plant be affected by immersion in a saltwater aquarium? A) The cells of the plant would shrink as water from the plant moved into the aquarium B) The cells of the plant would burst as water from the aquarium moved into the plant. Q) The solution inside each cell would get salty as the saltwater moved into the plant. D) The saltwater would not affect the plant in any way. 17) What is diffusion? A) the movement of water across a cell membrane B) the movement of molecules across a membrane, assisted by proteins embedded in the membrane C) one type of active transport D) the movement of molecules from an area of high concentration to an area of low concentration 18) Which statement describes enzymes? A) Enzymes can be recycled and used over and over again. B) Enzymes are not very specific. ) Enzymes are "used up" during chemical reactions. D) Enzymes are not affected by high heat, as proteins are. 19) What protein fibers help form the framework of structural support for cells? A) cytoskeletal elements C cholesterol B) centriole D) chromatin 20) Which organelle performs photosynthesis? B) mitochondrion

Explanation / Answer

ANSWER:

13) C) Chemical reactions in the body would never occur

14) A) The balloon would get larger as it gains water

15) A) Fermentation doesn't extract enough ATP from glucose to sustain our energy-carving cells

16) A) The cells of the plant would shrink as water from the plant moved into the aquarium

17) B) The movement of molecules from an area of high concentration to an area of low concentration

18) A) Enzymes can be recycled and used over and over again

19) A) Cytoskeletal elements

20) Chloroplast performs photosynthesis

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