How does an enzyme work to catalyze a reaction?
A. It raises the temperature of a reaction.
B. It lowers the activation energy of a reaction.
C. It allows the reaction to proceed through different intermediates.
D. It supplies the energy to speed up a reaction.
E. It increases the concentration of the reactants in a reaction.
B. It lowers the activation energy of a reaction.
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Chapter 43 described an important experiment by Otto Loewi that demonstrated the existence of chemical neurotransmitters. Loewi used frog hearts in dishes that exhibited a regular heartbeat even when disconnected from the rest of the body. This experiment would not have been possible if these hearts lacked
A. sinoatrial nodes. B. atrioventricular nodes. C. neurogenic pacemakers. D. cardiogenic pacemakers. E. atrioventricular valves.
The endospore stain
A. is applicable to only a few groups of bacteria. B. usually shows the spores as green structures among a background of pink cells. C. uses crystal violet as the primary stain. D. is an example of a negative stain. E. is applicable to only a few groups of bacteria AND usually shows the spores as green structures among a background of pink cells.
There are no infectious agents that can penetrate intact skin.
Answer the following statement true (T) or false (F)
Which of the following is a polysaccharide?
A) glucose, the chief cellular energy source B) cellulose, the primary component of plant cell walls C) fructose, one of the most important blood sugars D) insulin, the chief blood sugar regulator E) sucrose, one of the most important blood sugars