Biomolecules · Chemistry · COMEDK
MCQ (Single Correct Answer)
A small segment of a polypeptide gave on complete hydrolysis 3 molecules of alanine, 2 molecules of glycine and 3 molecules of cysteine. What is the number of peptide linkages in the segment of the polypeptide?
Identify the correct statement.
$$ \text { Match the characteristic from Col. I with the Vitamins given in Col. II. } $$
| $$ \text { Characteristics } $$ |
$$ \text { Vitamins } $$ |
||
|---|---|---|---|
| A | Water soluble that is not excreted easily | W | $$ \mathrm{B}_2 $$ |
| B | Prevents Cheilosis | X | $$ \mathrm{B}_6 $$ |
| C | Fat soluble | Y | $$ \mathrm{B}_12 $$ |
| D | Prevents seizures and convulsions | Z | E |
The secondary structure of protein consists of:
Which of the following is a correct match?
Which among the following is an INCORRECT statement?
Two statements, one Assertion and the other Reason are given. Choose the right option.
Assertion : Insulin is called a protein whereas Glycyl alanine is not called a protein
Reason : A polypeptide with amino acid residue less than 100 can also be called as a protein if it has a well-defined conformation of a protein.
Match A, B, C and D with the appropriate functions given.
| Column I | Functions | ||
|---|---|---|---|
| A. | Oxidoreductase | P. | Malfunctioning leads to Addison's disease. |
| B. | Phosphodiester bonds | Q. | Regulates responses to external stimuli. |
| C. | Adrenal cortex | R. | Catalyses glycolysis. |
| D. | Epinephrine | S. | Links nucleotides together. |
Two statements, one Assertion (A) and the other Reason (R) are given. Choose the correct option.
Assertion: Maltose, a disaccharide, is a reducing sugar and is obtained by the partial hydrolysis of starch in presence of the enzyme diastase.
Reason: Hydrolysis of one mole of Maltose gives one mole each of $\alpha-D-$ Glucose and $\beta-D-$ Fructose.
Match the reactions of Glucose given in Column I with the major product formed in the reaction as in Column II.
| Column I - Reactions | Column II - Major product | ||
|---|---|---|---|
| A. | $\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6+\mathrm{HI}$ (Heat) | P. | $\mathrm{HOOC}-(\mathrm{CHOH})_4-\mathrm{COOH}$ |
| B. | $\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6+\mathrm{Br}_2(\mathrm{aq})$ | Q. | $\mathrm{CH}_3-\left(\mathrm{CH}_2\right)_4-\mathrm{CH}_3$ |
| C. | $\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6+$ Conc. $\mathrm{HNO}_3$ | R. | $\mathrm{NH}_4 \mathrm{O}-\mathrm{OC}-(\mathrm{CHOH})_4-\mathrm{CH}_2 \mathrm{OH}$ |
| D. | $\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6+2\left[\mathrm{Ag}\left(\mathrm{NH}_3\right)_2\right] \mathrm{OH}$ | S. | $\mathrm{HOOC}-(\mathrm{CHOH})_4-\mathrm{CH}_2 \mathrm{OH}$ |
Given are 4 statements related to the chemical properties of Glucose.
Identify the two incorrect statements from the following.
A. It reacts with $$\mathrm{Br}_2$$ (aq) to form Saccharic acid.
B. Reacts with Acetic anhydride to form Glucose tetraacetate.
C. Reacts with Hydroxylamine to give Glucose oxime.
D. It reacts with ammoniacal $$\mathrm{AgNO}_3$$ to form ammonium salt of Gluconic acid with deposition of silver.
Two statements, Assertion and Reason are given. Choose the correct option from the following.
Assertion: In the secondary structure of RNA, double helix structure is formed.
Reason: In the double structure of RNA, two nucleic acid chains are wound about each other and held together by hydrogen bonds between pairs of bases
Match the Vitamins given in Column I with the diseases caused by their deficiency as given in Column II.
| Vitamin | Deficiency | ||
|---|---|---|---|
| (A) | K | (P) | Cheilosis |
| (B) | B$$_12$$ | (Q) | Osteomalacia |
| (C) | B$$_2$$ | (R) | Permicious Anaemia |
| (D) | D | (S) | Haemophilia |
With reference to vitamins and its deficiency diseases, the correct statements are:
(i) Cheilosis is due to the deficiency of Riboflavin
(ii) The deficiency of Vitamin B6 causes pernicious anaemia
(iii) Osteomalacia is due to the deficiency of Vitamin E
(iv) The deficiency of ascorbic acid causes scurvy
(v) The deficiency of Vitamin A causes xerophthalmia
Among the following peptides, identify the pair where the name and its structure are correctly matched.
Which of the following statement is not true about glucose?
Identify the 2 chemical tests which is not answered by Glucose having an open chain structure
[A] Reaction with Schiff's reagent and with Sodium bisulphite
[B] Reaction with $$\mathrm{HCN}$$ and with $$\mathrm{HI}$$
[C] Reaction with $$\mathrm{HNO}_3$$ and with Acetic anhydride
[D] Reaction with aqueous Bromine and with Hydroxylamine
Match the Hormones listed in Column I with their characteristics listed in Column II
| No. | Hormone | No. | Characteristics |
|---|---|---|---|
| A | Adrenal Cortex | P | Mediates responses to external stimuli. |
| B | Epinephrine | Q | Steroid hormone. |
| C | Estrogen | R | Iodinated derivative of Tyrosine amino acid. |
| D | Throxine | S | Its malfunction causes Addison's disease. |
Given below are 4 statements about Insulin. Which of these statement/(s) is/are correct?
[A] Insulin is a globular protein consisting of 51 Amino acids.
[B] Insulin is constituted of 3 polypeptide chains linked together.
[C] Insulin is constituted of 2 polypeptide chains linked together by disulphide bonds.
[D] The 3 polypeptide chains in Insulin are linked together by Hydrogen bonding.
Which of the following hexoses will form the same osazone when treated with excess phenyl hydrazine?
Pick out the incorrect statement(s) from the following.
1. Glucose exists in two different crystalline forms, $$\alpha$$-D-glucose and $$\beta$$-D-glucose.
2. $$\alpha$$-D-glucose and $$\beta$$-D-glucose are anomers.
3. $$\alpha$$-D-glucose and $$\beta$$-D-glucose are enantiomers.
4. Cellulose is a straight chain polysaccharide made of only $$\beta$$-D-glucose units.
5. Starch is a mixture of amylase and amylopectin, both contain unbranched chain of $$\alpha$$-D-glucose units.
Which one of the following is an important component of chlorophyll?
One among the 4 Vitamins belonging to $$\mathrm{B}$$ Complex, can be stored in our body. Identify the Vitamin.
Choose the incorrect statement regarding Cellulose.
What is the function platelets?
The monosaccharides of maltose is
The essential amino acids are
(i) Leucine (ii) Glutamic acid (iii) Asparagine (iv) Valine
correct option is
On treatment of glucose with bromine water the product formed is
Which of the following vitamin is responsible for Beri-Beri disease?
Carbon monoxide is poisonous to human beings because
Which one of the following sets of monosaccharides forms sucrose?
Which of the following amino acid (NH$$_2$$CHRCOOH) contains polar R group?
Among the following enzymes, which one is involved in the given below catalytic reaction?
$${C_6}{H_{12}}{O_6}(aq) \to 2{C_2}{H_5}OH(aq) + 2C{O_2}(g)$$
Xerophthalmia disease causes by which deficiency of vitamin?
The amino acid which is not optically active is