Question: Rennin acts on milk proteins and converts:
A.Caseinogen to casein
B.casein into paracasein
C.Caseinogens to paracasein
D.paracasein into caseinogen
Answer: Option B
: B

In the presence of calcium rennin changes irreversibly the casein of milk to a paracasein which is then acted upon by pepsin. This enzyme is said to be absent from the stomach of adults.”

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Question 1. Regarding the digestion of carbohydrates; Match the following intermediates with the particular enzyme:

Column I (Enzyme)Column II (Substrate)i. Amylasea. Maltose.ii. Maltaseb.Saccharides.iii.Sucrasec.Dextrins.iv. α Dextrinase  d.Sucrose.
  1.    i). → c., ii). → d., iii). →d., iv). → a..
  2.    i).→ b., ii).→ a., iii).→d., iv).→ c..
  3.    i).→ d., ii).→ b., iii).→ a., iv).→c..
  4.    i).→ a., ii).→c., iii).→ b., iv). →d..
Answer: Option B
: B

The correct matching pairs are :
So the correct option is B. i). b., ii). a., iii). c., iv). d..
Thesubstrateis a molecule upon which an enzyme acts. Enzymes catalyse chemical reactions involving thesubstrate.
Question 2. With reference to normal human beings, which of the following statements is not correct?
  1.    Human saliva is slightly alkaline
  2.    An adult may secrete 1-1.5 L of saliva per day
  3.    Saliva is secreted by six pairs of salivary glands in human beings
  4.    The salivary enzyme (ptayalin) breaks down cooked starch into maltose.
Answer: Option C
: C

There are three pairs of salivary glands in man which secrete saliva into the oral cavity through ducts. About 1000-1500 ml of saliva is secreted per day.
Question 3.  Which one of the following is a vestigial organ of humans?
  1.    Hair
  2.    Intestine
  3.    Wisdom teeth
  4.    Muscle of glottis
Answer: Option C
: C

Vestigial organs are present in reduced form and they are of no use to the animal, in which they are present. Man has 180 vestigial organs, eg, nictiating membrane, vermiform appendix, wisdom tooth, muscle of pinna and forehead, mammary glands in male.
Question 4. If pancreas is removed, the compound which remain undigested is
  1.    Proteins
  2.    Carbohydrates
  3.    Fats
  4.    All of these
Answer: Option D
: D

Pancreas secretes pancreatic juice that acts on all type of foods. It contains pancreatic amylase for the digestion of carbohydrates; trypsinogen, chymotry- psinogen and procarboxypeptidases for the digestion of proteins, pancreatic lipase for the digestion of fats and nuclease for nucleic acid.
Question 5. Which of the following carries glucose from digestive tract to liver?
  1.    Pulmonary vein
  2.    Hepatic artery
  3.    Hepatic portal vein
  4.    None of these
Answer: Option C
: C

A system of veins leading from the digestive tract to capillaries in the liver of a vertebrate is known as hepatic portal system. Thus, absorbed products of digestion (except fat) go straight to the liver and not to the heart. Pulmonary vein conveys oxygenated blood from the lungs to the left atrium of the heart. Hepatic artery supply blood to the liver.
Question 6. Rennin acts on milk proteins and converts:
  1.    Caseinogen to casein
  2.    casein into paracasein
  3.    Caseinogens to paracasein
  4.    paracasein into caseinogen
Answer: Option B
: B

In the presence of calcium rennin changes irreversibly the casein of milk to a paracasein which is then acted upon by pepsin. This enzyme is said to be absent from the stomach of adults.”

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