Which of the following enzymes functions at the lowest pH?
Trypsin
Pancreatic amylase
Pepsin
Salivary amylase
The Correct Answer is C
A. Trypsin functions in the small intestine, where the environment is slightly alkaline. Therefore, this enzyme does not function at a low pH.
B. Pancreatic amylase also functions in the small intestine, where the pH is neutral to slightly alkaline.
C. Pepsin functions in the stomach, where the environment is highly acidic (pH 1.5 to 2). Pepsin is the correct answer because it works optimally at this low pH.
D. Salivary amylase functions in the mouth, where the pH is neutral or slightly alkaline.
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Correct Answer is C
Explanation
A. Triglycerides are a type of fat found in the blood, but they are not classified as "bad cholesterol."
B. High-density lipoproteins (HDL) is known as "good cholesterol" because it helps remove cholesterol from the arteries.
C. Low-density lipoproteins (LDL) are referred to as "bad cholesterol" because high levels of LDL can lead to the build-up of plaque in arteries, increasing the risk of heart disease and stroke.
D. Chylomicrons are lipoproteins that transport dietary lipids from the intestines to other locations in the body. They are not classified as "bad cholesterol."
Correct Answer is A
Explanation
A. Small intestine; small intestine: Both amino acids and monosaccharides are absorbed in the small intestine, and fatty acids are also absorbed in the small intestine, where they are reassembled into triglycerides and incorporated into chylomicrons.
B. Small intestine; liver: Amino acids and monosaccharides are absorbed in the small intestine, but fatty acids are absorbed in the small intestine, not directly in the liver.
C. Stomach; small intestine: Amino acids and monosaccharides are absorbed in the small intestine, not the stomach, and fatty acids are absorbed in the small intestine, not the stomach.
D. Stomach; large intestine: Amino acids and monosaccharides are absorbed in the small intestine, and fatty acids are absorbed in the small intestine, not the stomach or large intestine.