Mr. jacobson, a tax accountant, comes to the clinic complaining of feeling very "stressed out" and anxious. he admits to drinking 10 to 12 cups of coffee daily. his doctor (knowing that caffeine alters the threshold of neurons) suggests he reduce his intake of coffee. what is caffeine's effect on the threshold of neurons, and how might this affect explain mr. jacobson's symptoms?

1. environmental factors, such as ph and temperature, can affect the function of an enzyme. a. true b. false 2. which of the following is an organic molecules (ex. vitamins) that an enzyme? a. coenzyme b. product c. active site d. substrate 3. how do enzymes effect the speed of a chemical reaction? a. they speed it up b. they slow it down c. they have no effect on the speed of a reaction 4. during a chemical reaction, an enzyme is used up so that it can only be used one time. a. true b. false 5. which of the following results from a chemical reaction that is catalyzed by an enzymes? a. active site b. product c. substrate d. coenzyme

20. in humans, freckles are dominant to no freckles. trey has no freckles and his wife anna grace has freckles, but her dad doesn't. they want to know what percentage of their kids would look like trey. show a punnett square to support your answer.

The mixture of sperm and fluids from the seminal vesicles, prostate gland, and cowper's glands is called