Catalase is an important enzyme because it
A) Protects organisms that utilize oxygen from a toxic by product of respiration
B) Can break down oxygen
C) Produces carbon dioxide
D) Produces hydrogen peroxide
A) Protects organisms that utilize oxygen from a toxic by product of respiration
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You have dermatitis triggered by a particular material in your socks. Your feet are covered with a really itchy rash, which has developed blisters over the last day or so. You had first worn them 2 to 3 days ago, and you did not launder them after buying them at the store. Finding some antihistamine medication in your bathroom cabinet, you decide to take it to relieve the itching rash. Which statement is true?
A. The antihistamine will make the rash worse because it reacts with chemicals release by the lymphocytes in your skin, exacerbating the situation. B. The rash will go away because the antihistamine neutralizes the histamine chemicals coming from mast cells in your skin. C. The anti-histamine will have no effect because once a type I hypersensitivity kicks in, it will last for a few days. D. The anti-histamine will have no effect on the rash because histamine is not the chemical mediator in this hypersensitivity.
An allosteric enzyme:
a. has an active site where substrate molecules bind and another site that binds with regulatory molecules b. is an important energy-carrying nucleotide c. carries out either oxidation reactions or reduction reactions, but not both d. raises the activation energy of the chemical reaction it catalyzes e. only participates in feedback inhibition pathways
An electron microscope uses ________ lenses to focus beams of electrons onto a specimen.
Fill in the blank(s) with the appropriate word(s).
Describe the functions of the four layers of the digestive tract (mucosa, submucosa, muscularis, and serosa) and indicate how they work together to acquire and distribute nutrients
What will be an ideal response?