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

Enzymes of salivary glands, stomach and small intestine works at pH __, __ and ___ respectively.

  1. 6.8, 2, 8

  2. 8,2, 6.8

  3. 2,8,6.8

  4. 6.8, 8,2
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Salivary amylase works best at a slightly acidic pH of about 6.8, gastric enzymes (like pepsin) work in a highly acidic environment (pH 1-2), and intestinal enzymes work in an alkaline environment (pH 8).

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

Identify the correctly matched structure and its secretion

  1. Brunners glands Salivary amylase

  2. Intestinal mucosa Insulin

  3. Gall bladder Bile

  4. Salivary gland Lysozyme

  5. Goblet cells - HCl
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Salivary glands secrete saliva containing enzymes like salivary amylase and lysozyme, which provides antibacterial protection. Brunner's glands secrete alkaline mucus, not amylase.

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

Which is not correct

  1. Human saliva is near neutral

  2. An adult secretes 1.0 1.5 l of saliva per day

  3. Saliva is secreted by six pairs of glands

  4. Ptyalin breaks down cooked starch into maltose
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

There are three pairs of salivary glands (parotid, submandibular, and sublingual), not six pairs. Therefore, the statement that there are six pairs is incorrect.

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

Choose the wrong statement among the following

  1. Trypsinogen is activated by enterokinase

  2. Optimum pH for salivary amylase is 8.9

  3. Rennin helps in digestion of milk proteins

  4. Goblet cells secrete mucus

  5. Submucosal glands of intestine are also known as Brunners glands
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Salivary amylase has an optimum pH of approximately 6.8. A pH of 8.9 is alkaline and would inhibit the activity of salivary amylase.

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

A lubricant mucin, in saliva, is made up of

  1. Polyunsaturated fats

  2. Actin and myosin

  3. Glycoproteins

  4. Phospholipids
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
A. Polyunsaturated fats are the fats in which hydrocarbon chain has two or more double bonds.
B. Actin and myosin are the protein filaments which help in muscle contraction.
C. Proteins associated with carbohydrates i.e. sugars attached to them, are called glycoproteins.
D. Lipids that contain a phosphate group, are called phospholipids.
The lubricant mucin in saliva is a glycoprotein. 
So, the correct answer is 'Glycoproteins'.
Multiple choice bio-chemistry digestive system of human digestive system- glands mouth and buccal cavity digestive glands

About how much saliva does a person produce each day?

  1. 100 ml

  2. 250 ml

  3. 500 ml

  4. 1500 ml
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Humans produce between one-fifth and one-third of a gallon (0.75 to 1.5 liters) of saliva every day. However, saliva production mostly takes place while a person is awake. During sleep, saliva production drops to almost nothing. Most of the saliva comes from the glands at the bottom of the mouth, and the rest comes primarily from the parotid glands, near the top back of the mouth.

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

Numbers of pairs of salivary glands present in rabbit are

  1. One

  2. Three

  3. Four

  4. Five
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The rabbit has four major pairs of salivary glands: the parotid, mandibular, sublingual and zygomatic. Amylase and galactosidase are produced in the saliva, which is produced continuously by the mandibular glands and in response to food intake by the others.