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12th Grade > Chemistry

BIOMOLECULES MCQs

Total Questions : 30 | Page 1 of 3 pages
Question 1. αD glucose and βD glucose differ from each other due to difference in one of the carbons with respect to its
  1.    Size of hemiacetal ring
  2.    Configuration
  3.    Number of -OH groups
  4.    Conformation
 Discuss Question
Answer: Option B. -> Configuration
:
B
Option (b)
α−D− glucose And β−D− Glucose Differ From Each O...
It is clear from the above picture that there is no other difference in these 2 structures other than the difference at the C-1 carbon, which can be attributed to the difference in the configuration of the carbon. This carbon is referred to as the anomeric carbon to highlight this important feature.
Question 2. A substance forms zwitter ion. It can have which of the following functional groups?
  1.    −NH2,−COOH   
  2.     −NH2,−SO3H 
  3.    Both
  4.    None of these
 Discuss Question
Answer: Option C. -> Both
:
C
Option (c)
A substance tht formsZwitter ion can have functional groups NH2COOH and NH2NH2SO3H
Question 3. Hydrolysis reaction of fats, with caustic soda, is known as
  1.    Acetylation
  2.    Carboxylation
  3.    Saponification
  4.    Esterification
 Discuss Question
Answer: Option C. -> Saponification
:
C
Option (c)
Oil/fat + Alkali Saponification−−−−−−−− Soap + Glycerol.
Question 4. Identify the correct statement regarding enzymes.
  1.    Enzymes are specific biological catalysts that cannot be poisoned
  2.    Enzymes are normally heterogeneous catalysts that are very specific in their action
  3.    Enzymes are specific biological catalysts that can normally function at very high temperature (T ~ 1000K)
  4.    Enzymes are specific biological catalysts that possess no well-defined active sites.
 Discuss Question
Answer: Option A. -> Enzymes are specific biological catalysts that cannot be poisoned
:
A
Option (a)
Enzymes are specific biological catalysts that cannot be poisoned.
They are not necessarily heterogeneous catalysts: those in solution in the cellular medium are homogeneous, those bound to a membrane are heterogeneous.
We have seen they perform best at the temeperature close to our normal body temperature around 310 K. At very high temperatures, they become denatured.
Question 5. Which of the following is not an essential amino acid
  1.    Valine
  2.    Lysine
  3.    Histidine
  4.    Glycine
  5.    If assertion is false but reason is true.
 Discuss Question
Answer: Option D. -> Glycine
:
D
Option (d)
The nine essential amino acids are:histidine isoleucine,leucine, lysine,methionine, phenylalanine,threonine , tryptophan, and valine
Question 6. Proteins are hydrolysed by enzymes into
  1.    Dicarboxylic acids
  2.    Hydroxy acids
  3.    Amino acids
  4.    Aromatic acids
 Discuss Question
Answer: Option C. -> Amino acids
:
C
Option (c)
ProteinEnzyme−−−−Aminoacid(Acidicmediuminstomach)
Question 7. Cane sugar on hydrolysis gives 
  1.    Glucose and maltose
  2.    Glucose and lactose
  3.    Only glucose
  4.    Glucose and fructose
 Discuss Question
Answer: Option D. -> Glucose and fructose
:
D
Option (d)
C12H22O11Canesugar+H2OC6H12O6Glucose+C6H12O6Fructose
Question 8. An example of a sulphur containing amino acid is
  1.    Lysine
  2.    Serine
  3.    Cysteine
  4.    Tyrosine
 Discuss Question
Answer: Option C. -> Cysteine
:
C
Option (c)
An Example Of A sulphur Containing Amino Acid Is
You can clearly see that cysteine is the only amino acid from the options given which contains a sulphur in its structure. You can remember this by going back to the video of the secondary structure of proteins where we talka about the Disulphide linkages which gives shape to the protein sheets.
Question 9. An indigestible carbohydrate, which is also a constituent of our diet, is
  1.    Cellulose
  2.    Galactose
  3.    Maltose
  4.    Starch
 Discuss Question
Answer: Option A. -> Cellulose
:
A
We cannot digest cellulose, which is a polysaccharide. Our digestive system is not capable of digesting this tough carbohydrate. However, herbivorous animals like cows are well-equipped to do just that.
Question 10. In both DNA and RNA, heterocyclic base and phosphate ester linkages are at
  1.    C′5 and C′2 respectively of the sugar molecule
  2.    C′2 and C′5 respectively of the sugar molecule
  3.    C′1 and C′5 respectively of the sugar molecule
  4.    C′5 and C′1 respectively of the sugar molecule
 Discuss Question
Answer: Option C. -> C′1 and C′5 respectively of the sugar molecule
:
C
Option (c)
In Both DNA And RNA, Heterocyclic Base And Phosphate Ester L...
You can see that the base is at theC1 carbon and the phosphate linkage is at theC5 carbon.

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