Role of Acids and Bases in Biological Systems
Chemistry ⇒ Acids, Bases, and Salts
Role of Acids and Bases in Biological Systems starts at 11 and continues till grade 12.
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Describe how acid rain can affect aquatic biological systems.
Describe the effect of a drastic change in pH on enzyme activity in living organisms.
Describe the effect of alkalosis on the nervous system.
Describe the importance of maintaining pH in the digestive tract.
Describe the role of amino acids as buffers in biological systems.
Describe the role of hemoglobin in buffering blood pH.
Explain how lactic acid is produced in muscles and its effect on pH.
Explain how the bicarbonate buffer system helps maintain blood pH in humans.
Which of the following acts as a buffer in human blood?
(1) Sodium chloride
(2) Bicarbonate ion
(3) Glucose
(4) Urea
Which of the following best describes the effect of vomiting on blood pH?
(1) It causes acidosis.
(2) It causes alkalosis.
(3) It has no effect.
(4) It lowers blood pH.
Which of the following best describes the role of hydrochloric acid (HCl) in the human stomach?
(1) It neutralizes stomach contents.
(2) It aids in protein digestion by activating pepsinogen.
(3) It increases the pH of the stomach.
(4) It acts as a base to absorb nutrients.
Which of the following best explains why the pH of saliva changes after eating?
(1) Saliva becomes more acidic due to increased acid production.
(2) Saliva becomes more basic due to increased bicarbonate secretion.
(3) Saliva pH does not change.
(4) Saliva becomes neutral due to water intake.
A solution with a pH of 5 is considered _______.
Fill in the blank: The _______ buffer system is important in maintaining the pH of blood plasma.
Fill in the blank: The _______ buffer system is the primary buffer in the cytoplasm of cells.
Fill in the blank: The _______ group in amino acids can accept a proton, acting as a base.
True or False: All metabolic reactions in the body require a neutral pH to occur.
True or False: Enzymes in biological systems are highly sensitive to changes in pH.
True or False: Proteins can act as buffers in biological systems.
True or False: The pH of the small intestine is higher than that of the stomach.
