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Digestion and Absorption Test - 31

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Digestion and Absorption Test - 31
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  • Question 1
    1 / -0
    Casein present in milk is a
    Solution
    Casein is the phosphoproteins commonly found in mammalian milk, making up 80% of the proteins in cow milk and between 20% and 45% of the proteins in human milk.
  • Question 2
    1 / -0
    Ptyalin is secreted by
    Solution
    Ptyalin is a protein found in saliva, that breaks down the insoluble starch found in foods into smaller, soluble sugar fragments. This is another name for the amylase found in saliva, known as salivary amylase. This particular type of amylase is found only in humans.
  • Question 3
    1 / -0
    Which substance of saliva destroy the harmful bacteria?
    Solution
    Human lysozyme is commonly associated with innate immunity, which forms the first line of defense against infections. In the human body, it functions primarily as an antimicrobial by breaking down the carbohydrates in bacterial cell walls, killing the bacteria. This is why it is such an effective cell lysis agent. In saliva, it protects the oral cavity from pathogens and in times of increased inflammation, there is an increase in lysozyme present. Lysozyme also has fungicidal properties, protecting mucosal areas from invasion by pathogenic yeast or fungi.
  • Question 4
    1 / -0
    In which part of stomach mainly digestion occurs?
    Solution
    The stomach, located in the upper left portion of the abdominal cavity, has three major parts a cardiac portion where the esophagus opens, a fundic region and a pyloric portion which opens into the first part of small intestine. The most important part is the fundic part which forms the body of the stomach and produces most of the digestive enzymes for digestion. Therefore, the correct answer is option B.
  • Question 5
    1 / -0
    Which one of the following is not a constituent of saliva?
    Solution
    Human saliva is 99.5% water, while the other 0.5% consists of electrolytes, mucus, glycoproteins, enzymes, and antibacterial compounds such as secretory IgA and lysozyme.
  • Question 6
    1 / -0
    Ptyalin, an enzyme work in saliva, which is
    Solution
    The stomach is highly acidic and these conditions are very unfavorable for ptyalin, which prefers a pH of about 6.9 for activity. Ptyalin is a protein found in saliva, that breaks down the insoluble starch found in foods into smaller, soluble sugar fragments. This is another name for the amylase found in saliva, known as salivary amylase. This particular type of amylase is found only in humans.
  • Question 7
    1 / -0
    The enzyme invertase hydrolase turns
    Solution
    Invertase is an enzyme, that catalyzes the hydrolysis (breakdown) of sucrose. The resulting mixture of fructose and glucose is called inverted sugar syrup. Sucrase is also called invertase. Invertase hydrolyze sucrose to give the same mixture of glucose and fructose.
  • Question 8
    1 / -0
    Milk protein is curdled into calcium paracacinate by
    Solution
    Rennin is a proteolytic enzyme found in gastric juice of infants which helps in the digestion of milk proteins. Its action on milk is called curdling of milk. Rennin is secreted as pro rennin, which changes into active rennin in the presence of HCl. Rennin curdle milk protein caseinogens, which is hydrolysed into casein. It converts casein into solid calcium paracaseinate in presence of Ca$$^{2+}$$. 
  • Question 9
    1 / -0
    Amylase enzyme acts on the
    Solution
    • Amylase is a digestive enzyme that acts on starch in food, breaking it down into smaller carbohydrate molecules. The enzyme is made in two places. 
    • First, salivary glands in your mouth make salivary amylase, which begins the digestive process by breaking down starch when you chew your food, converting it into maltose, a smaller carbohydrate.
    • Cells in your pancreas make another type of amylase, called pancreatic amylase, which passes through a duct to reach your small intestine. Pancreatic amylase completes digestion of carbohydrate. Hence, the amylase enzyme acts on the starch.
    So, the correct answer is 'starch'.

  • Question 10
    1 / -0
    In which animal, body temperature is controlled by its tongue?
    Solution
    Dogs tongue helps to regulate body temperature as well. As air passes back and forth over the tongue when a dog pants, it cools down the body. The cooling is also enhanced as saliva evaporates from the mouth.
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