Tag: bio-chemistry

Quizzes (82) Questions (1918)

Questions Related to bio-chemistry

Multiple choice bio-chemistry digestion digestion in small intestine digestive glands and their secretions alimentary canal

In jejunum, which of the following enzymes is required for the digestion of amino acid containing compounds?

  1. Chymotrypsin

  2. Pepsin

  3. Trypsin

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

Peptidases are the intestinal proteases, which act on peptides as follows:
$Polypeptide\xrightarrow[Alkaline \,medium]{Polypeptidase} Dipeptides$


$Dipeptide\xrightarrow[Dipeptidase]{Alkaline \,medium} Amino acids$
Pepsin, trypsin, and chymotrypsin, etc are aminopeptidases, which act upon amino groups of the peptide bond. 
Thus the correct answer is option D.

Multiple choice bio-chemistry digestion digestion in small intestine digestive glands and their secretions alimentary canal

VERY SHORT ANSWER TYPE
Consider the following two statements A & B and select the right from (i)-(iv) about their correctness.
A. Small intestine is shorter than large intestine.
B. Small intestine is wider than large intestine.

  1. Both the statements are correct.

  2. Both the statements are wrong.

  3. Statement A is correct, B is wrong.

  4. Statement B is correct, A is wrong.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Statement A is incorrect because the small intestine is actually much longer than the large intestine, measuring about 6 to 7 meters in humans compared to the large intestine's 1.5 meters. Statement B is also incorrect because the small intestine is narrower in diameter than the large intestine, which is why they are named small and large based on width rather than length.

Multiple choice bio-chemistry digestion digestion in small intestine digestive glands and their secretions alimentary canal

If the inner surface of the ileum in the human small intestine was smooth, rather than being folded and subdivided into vilii, which of the following statements would be true? 

  1. The rate of absorption of digested food molecules would be higher, because the digested food would pass more easily through the digestive tract.

  2. Digestion would not be as effective, because there would be fewer cells secreting trypsin (a protein-digesting enzyme).

  3. Humans would have needed to evolve a much longer small intestine to absorb sufficient nutrients from their food.

  4. Humans would not be able to survive, because the digestive tract would be more susceptible to damage.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The correct answer is (c).

Multiple choice bio-chemistry digestion digestion in small intestine digestive glands and their secretions alimentary canal

Which of the following statements is false?

  1. The breakdown of most of biomacromolecules occurs in duodenum.

  2. Simple substances (digested foods) are absorbed in the jejunum and ileum.

  3. Significant digestive activity occurs in large intestine.

  4. Undigested and unabsorbed substances are passed on to the large intestine.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The correct answer is (c).

Multiple choice bio-chemistry digestion digestion in small intestine digestive glands and their secretions alimentary canal

Match the two columns and select the right one among options given.

Column I Column II
A. Duodenum  (i) A cartilaginous flap
B. Epiglottis  (ii) Small blind sac
C. Glottis  (iii) 'U' shaped structure emerging from the stomach
D. Caecum  (iv) Opening of wind pipe

  1. A-(i), B-(ii), C-(iii), D-(iv)

  2. A-(iv), B-(iii), C-(iv), D-(i)

  3. A-(iii), B-(i), C-(iv), D-(ii)

  4. A-(ii), B-(iv), C-(i), D-(iii)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

(A) Duodenum - 'U' shaped structure emerging from the stomach

(B) Epiglottis - A cartilaginous flap
(C) Glottis - Opening of wind pipe
(D) Caecum - Small blind sac
So, the correct answer is (c).

Multiple choice bio-chemistry carbohydrate metabolism energy output living organisms and energy production respiration in cell

What is ATP?

  1. A hormone

  2. A protein

  3. An enzyme which brings about oxidation

  4. A molecule which contains high energy bond
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

  • Adenosine triphosphate (ATP) is a nucleotide with three phosphates. The ATP is produced by the addition of phosphorous to nucleoside adenosine.
  • The first phosphate is attached by an ester bond. This bond is a normal covalent bond and not a high energy bond. 
  • The two-terminal phosphates are bonded by high energy acid anhydride bonds. 

Thus one molecule of ATP contains two high energy bonds.

Multiple choice bio-chemistry carbohydrate metabolism energy output living organisms and energy production respiration in cell

ATP stands for which of the following?

  1. Adenosine phosphate

  2. Adenine triphosphate

  3. Adenosine diphosphate

  4. Adenosine triphosphate
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Chemically ATP is a nucleotide. In fact it is a higher order nucleotide because it contains not one but three phosphates. Compounds made up of (pentose) sugar and a nitrogenous base are called nucleosides. If the base is adenine, the nucleoside will be called adenosine. 

If one phosphate is attached to adenosine through an ester bond then the compound becomes a nucleotide and in this case it is called adenylic acid or adenosine monophosphate.
When second phosphorous is attached to the first phosphorous, through an acid anhydride bond, the nucleotide is called adenosine diphosphate. When third phosphorous is attached to the second phosphate through another acid anhydride bond, the nucleotide is called adenosine triphosphate or ATP.

Multiple choice bio-chemistry carbohydrate metabolism energy output living organisms and energy production respiration in cell

$\sim P$ in ATP represents

  1. Two bonds with high energy

  2. Two moles of phosphorus

  3. Three atoms of high energy phosphate

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
ATP is known as energy currency of the cell and it is a nucleotide formed by the combination of adenine as a nitrogenous base, ribose sugar, and triphosphate. It is found in free cells which breaks to form energy by breaking it's high energy phosphate bonds. The high energy phosphate bonds break to form ADP and AMP. It is a hydrolysis reaction which occurs at extreme pH. It dephosphorylates to provide energy for metabolic function.
ATP has three phosphate out of which one is directly attached to the ribose with phosphate ester bond and it is low energy bond. The bond between two phosphate groups is a phosphoanhydride bond which is considered as high energy bond. So ATP has only two high energy bond phosphoanhydride bond.
So, the correct answer is option A.
Multiple choice bio-chemistry carbohydrate metabolism energy output living organisms and energy production respiration in cell

Conversion of ATP to ADP releases

  1. Energy

  2. Enzyme

  3. Hormone

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

Adenosine Triphosphate or ATP has stored energy in its bond with the third phosphate group. However when required, ATP loses its third phosphate group to release energy and gets converted back to ADP. The energy released is in the form of chemical energy that the cells can use.

So the answer is 'Energy'.