Biomolecules

The correct statement with regard to the secondary structure of DNA/RNA is :

1. DNA possesses a double strand helix structure and contains thymine as one of the four bases
2. DNA possesses a single strand helix structure and contains uracil as one of the four bases
3. RNA possesses a double strand helix structure and contains uracil as one of the four bases
4. RNA possesses a single strand helix structure and contains thymine as one of the four bases

The correct statement about peptides and proteins is

1. In -helices, the polypeptide chain is twisted into a left-handed screw (helix) through intramolecular hydrogen bonds
2. Tertiary structure of proteins has two or more polypeptide subunits
3. Only the proteins having a quaternary structure are biologically active
4. In -pleated sheet structures, peptide chains are held together by intermolecular hydrogen bonds

The amino acid that gives a red-blood colour on treating its sodium fusion extract with sodium nitroprusside is

1. serine
2. leucine
3. threonine
4. methionine

Sugar 'X' A. is found in honey B. is a keto sugar C. exists in and -anomeric forms. D. Is laevorotatory. 'X' is :

1. Maltose
2. Sucrose
3. D-Glucose
4. D-Fructose

The reagents with which glucose does not react to give the corresponding tests/products are Choose the correct options from the given below:

1. B and C
2. A and D
3. B and E
4. E and D

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below :

1. Statement I is true but Statement II is false.
2. Statement I is false but Statement II is true.
3. Both Statement I and Statement II are true.
4. Both Statement I and Statement II are false.

Given below are two statements: In the light of the above statements, choose the correct answer from the options given below:

1. Both Statement I and Statement II are false
2. Statement I is true but Statement II is false
3. Statement I is false but Statement II is true
4. Both Statement I and Statement II are true

The incorrect statement regarding enzymes is

1. Enzymes are biocatalysts.
2. Like chemical catalysts enzymes reduce the activation energy of bio processes.
3. Enzymes are polysaccharides.
4. Enzymes are very specific for a particular reaction and substrate.

The incorrect statement about denaturation of proteins is :

1. Uncoiling of the helical structure takes place
2. It results due to change of temperature and/or pH
3. It results in loss of biological activity of proteins
4. A protein is formed from amino acids linked by peptide bonds

The RBC deficiency is deficiency disease of :

1. Vitamin B2
2. Vitamin B12
3. Vitamin B6
4. Vitamin B1

Which of the following is a basic amino acid?

1. Alanine
2. Tyrosine
3. Lysine
4. Serine

Sucrose on hydrolysis gives :

1. -D-Glucose + -D-Glucose
2. -D-Glucose + -D-Fructose
3. -D-Fructose + -D-Fructose
4. -D-Glucose + -D-Fructose

The non-essential amino acid among the following is :

1. alanine
2. lysine
3. valine
4. leucine

The difference between amylose and amylopectin is

1. amylopectin have 1 4 -linkage and 1 6 -linkage
2. amylose have 1 4 -linkage and 1 6 -linkage
3. amylopectin have 1 4 -linkage and 1 6 -linkage
4. amylose is made up of glucose and galactose

Which of the following compounds can form a zwitter ion?

1. Aniline
2. Acetanilide
3. Benzoic acid
4. Glycine

Which of the following statements is not correct?

1. Ovalbumin is a simple food reserve in egg-white.
2. Blood proteins thrombin and fibrinogen are involved in blood clotting.
3. Denaturation makes the proteins more active.
4. Insulin maintains sugar level in the blood of a human body.

The correct statement regarding RNA and DNA, respectively is

1. The sugar component in RNA is arabinose and the sugar component in DNA is ribose
2. The sugar component in RNA is 2'-deoxyribose and the sugar component in DNA is arabinose
3. The sugar component in RNA is arabinose and the sugar component in DNA is 2'-deoxyribose
4. The sugar component in RNA is ribose and the sugar component in DNA is 2'-deoxyribose.

In a protein molecule various amino acids are linked together by

1. peptide bond
2. dative bond
3. -glycosidic bond
4. -glycosidic bond.

Which one given below is a non-reducing sugar?

1. Glucose
2. Sucrose
3. Maltose
4. Lactose

The central dogma of molecular genetics states that the genetic information flows from

1. Amino acids Proteins DNA
2. DNA Carbohydrates Proteins
3. DNA RNA Proteins
4. DNA RNA Carbohydrates

The correct corresponding order of names of four aldoses with configuration given below [figure] respectively, is

1. L-erythrose, L-threose, L-erythrose, D-threose
2. D-threose, D-erythrose, L-threose, L-erythrose
3. L-erythrose, L-threose, D-erythrose, D-threose
4. D-erythrose, D-threose, L-erythrose, L-threose

Which of the following hormones is produced under the condition of stress which stimulate glycogenolysis in the liver of human beings?

1. Thyroxine
2. Insulin
3. Adrenaline
4. Estradiol

D(+)-glucose reacts with hydroxylamine and yields an oxime. The structure of the oxime would be

1. [figure]
2. [figure]
3. [figure]
4. [figure]

In DNA, the linkages between different nitrogenous bases are

1. phosphate linkage
2. H-bonding
3. glycosidic linkage
4. peptide linkage

Deficiency of vitamin B1 causes the disease

1. convulsions
2. beri-beri
3. cheilosis
4. sterility

Which one of the following sets of monosaccharides forms sucrose?

1. -D-galactopyranose and -D-glucopyranose
2. -D-glucopyranose and -D-fructofuranose
3. -D-glucopyranose and -D-fructofuranose
4. -D-glucopyranose and -D-fructopyranose

Which of the following is not a fat soluble vitamin?

1. Vitamin B complex
2. Vitamin D
3. Vitamin E
4. Vitamin A

Which of the statements about "Denaturation" given below are correct?

1. B and C
2. A and C
3. A and B
4. A, B and C

Which one of the following statements is not true regarding (+) lactose?

1. On hydrolysis (+) lactose gives equal amount of D(+) glucose and D(+) galactose.
2. (+) Lactose is a -glucoside formed by the union of a molecule of D(+) glucose and a molecule of D(+) galactose.
3. (+) Lactose is a reducing sugar and does not exhibit mutarotation.
4. (+) Lactose, C12H22O11 contains 8 –OH groups

Fructose reduces Tollens' reagent due to

1. asymmetric carbons
2. primary alcoholic group
3. secondary alcoholic group
4. enolisation of fructose followed by conversion to aldehyde by base