Tag: bio-chemistry

Quizzes (82) Questions (1918)

Questions Related to bio-chemistry

Multiple choice bio-chemistry digestive system of human digestive system- glands mouth and buccal cavity digestive glands

With reference to a normal human being, which one of the following statements is not correct?

  1. Human saliva is slightly acidic
  2. An adult human may secrete $1$ to $1.5$ litres of saliva per day

  3. Saliva is secreted by six pairs of salivary glands in human beings

  4. The salivary enzymes(ptyalin) breaks down cooked starch into maltose
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Human saliva is secreted by three major pairs of salivary glands, namely the parotid, submandibular, and sublingual glands, making it three pairs rather than six pairs in total. The other statements are correct, as human saliva is slightly acidic, adults secrete about 1 to 1.5 liters per day, and ptyalin digests cooked starch into maltose.

Multiple choice bio-chemistry digestive system of human digestive system- glands mouth and buccal cavity digestive glands

What is optimum pH for the action of salivary anylase?

  1. $1.8$
  2. $6.8$
  3. $7.4$
  4. $8$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The optimum pH for the enzymatic activity of salivary amylase ranges from 6 to 7. Above and below this range, the reaction rate reduces as enzymes get denaturated. The enzyme salivary amylase is most active at pH 6.8. 

So, the correct option is '6.8'.

Multiple choice bio-chemistry digestive system of human digestive system- glands mouth and buccal cavity digestive glands

Salivary glands secrete

  1. Amylase

  2. Pepsin

  3. Trypsin

  4. Bile juice
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An amylase is an enzyme that catalyses the hydrolysis of starch into sugars. Amylase is present in the saliva of humans and some other mammals, where it begins the chemical process of digestion. Bile juice is secreted by liver. Pepsin and trypsin are produced in small intestine. 

Therefore, the correct answer is option A.

Multiple choice bio-chemistry digestive system of human digestive system- glands mouth and buccal cavity digestive glands

A digestive enzyme, salivary amylase, in the saliva being digestion of 

  1. Protein

  2. Nucleic acids

  3. Fats

  4. Carbohydrates
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • 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. 
  • The breakdown of starch is just one of the many steps in the process of digestion. Although digestion begins in the mouth, it continues in the stomach and intestines.
  • Amylase is an enzyme that breaks down starch to sugar. The amylase in the mouth, salivary amylase, is called ptyalin. 
  • Ptyalin can do digestive can work in the stomach for several hours. Iodine and Benedict's solution is used to recognize starch and sugar (maltose) in our saliva.
Therefore, the correct answer is option D.
Multiple choice bio-chemistry digestive system of human digestive system- glands mouth and buccal cavity digestive glands

Amount of saliva secreted daily in humans is

  1. 250 ml

  2. 500 ml

  3. 100 ml

  4. 1000 ml
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

There are three major parts of salivary glands that secrete saliva with the digestive enzyme such as parotid, submandibular and sublingual glands. Normally secretion of saliva is constant, regardless of the presence of food in the mouth. The amount of saliva secreted in 24 hours usually amounts from 1 liter to 1.5 litres. 

Therefore, the correct answer is option D.

Multiple choice bio-chemistry digestive system of human digestive system- glands mouth and buccal cavity digestive glands

A salivary gland is________________

  1. Brunners gland

  2. Sublingual gland

  3. Lacrimal gland

  4. Adrenal gland
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • The sublingual gland is one of the three salivary glands present. They are located beneath the mucous membrane of the floor of the mouth. The other salivary glands are the parotid and the submandibular glands. 
  • Brunner's glands are present in the duodenum of the small intestine and helps in the release of mucous and proteolytic enzymes. Lacrimal glands are exocrine glands that supply tears to the corner of the eye. 
  • Adrenal glands are endocrine glands present above the kidneys that are involved in the production of a large number of different hormones. So, the correct answer is 'sublingual gland'.
Multiple choice bio-chemistry digestive system of human digestive system- glands mouth and buccal cavity digestive glands

Wharton's duct is associated with 

  1. Brunner's gland

  2. Sublingual salivery gland

  3. Submaxillary salivary gland

  4. Parotid salivary gland
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
A. Brunner's glands are found in the duodenum region of small intestine. Their secretions protect the walls of the intestine from the action of gastric juices.
B. Sublingual salivary glands are the smallest glands present beneath the tongue These open at the floor of buccal cavity through ducts of Rivinus.
C. Submaxillary salivary gland are also called submandibular glands. These are medium sized glands and the duct of these glands is called Wharton's duct that opens in the oral cavity near the lower central incisors.
D. Parotid salivary glands are the largest salivary glands of the body. The duct of these glands is called Stenson's duct.
So, the correct answer is 'Submaxillary salivary gland'.