Tag: biochemistry

Questions Related to biochemistry

Why tails of lipids in the membrane are towards inner part?

bio-chemistry lipids functions of lipids biomolecules: chemical constituents of living cells biochemistry

  1. The tails is non-polar hydrocarbon and so, protected with an aqueous environment

  2. The tail is polar hydrocarbon and so, is protected from aqueous environment

  3. The non-polar or hydrophobic hydrocarbon trails of lipid, being on inner side ensure their protection from aqueous environment.

  4. The tail is hydrophilic so, it tends to be located in the aqueous inner side of membrane

Show answer
Correct Option: C
Explanation:

The tails of the lipids are made up of fatty acids. These are non-polar hydrophobic so they tend to arrange away from the cytoplasmic face as well as the extracellular face. So, they avoid aqueous medium by arranging themselves towards the inner part of the cell membrane.

Hence, the correct answer is 'The non-polar or hydrophobic hydrocarbons tails of lipid, being on inner side ensure their protection from the aqueous environment.

Which of the following can be traced in phospholipids of brain tissue and soybeans?

bio-chemistry lipids functions of lipids biomolecules: chemical constituents of living cells biochemistry

  1. Phosphoglycerides

  2. Phosphoinositides

  3. Cholesterol

  4. None of the above

Show answer
Correct Option: B
Explanation:

Phosphoinositides make up a small fraction of cellular phospholipids, They play a fundamental role in controlling membrane-cytosol interfaces, regulation of membrane traffic and the permeability and transport functions of membranes. They are found in brain tissue in animals and soybean seeds. Thus the correct answer is option B.

Deficiency of EFA causes

bio-chemistry lipids functions of lipids biomolecules: chemical constituents of living cells biochemistry

  1. Follicular keratosis

  2. Kidney failure

  3. Sterility

  4. All the above

Show answer
Correct Option: D
Explanation:

Essential fatty acids (EFA) are those fatty acids that body cannot produce on its own and therefore must be supplied from the diet. Deficiency of EFA causes many disease conditions like dry and scaly skin, follicular keratosis (hard and dry skin around hair follicles), bumps on back of upper arms, color variation of skin, dry eyes, mouth and throat, menstrual cramps, dry vagina, excessive thirst, eczema, asthma, hay fever, painful joint. In severe cases, it may result in kidney failure and sterility.

Thus, the correct answer is option D. 

The enzyme that is not associated in the preparation of $C _{2}H _{5}OH$ from starch is:

chemistry biochemistry enzymes and hormones hormones coordination in human beings- chemical control

  1. maltase

  2. diastase

  3. invertase

  4. zymase

Show answer
Correct Option: C
Explanation:
Starch is hydrolyzed to Maltose by an enzyme called diastase
Maltase converts Maltose to Glucose
Zymase converts Glucose to ethanol.
So the enzyme that is not associated in the preparation of ${C} _{2}{H} _{5}OH$ from starch is invertase

Coenzyme is :

chemistry biochemistry enzymes and hormones hormones coordination in human beings- chemical control

  1. the non-protein component of an enzyme which is loosely held by the enzyme and necessary for its biological activity

  2. the protein component of an enzyme which is loosely held by the enzyme and necessary for its biological activity

  3. the non-protein or protein component of an enzyme which is loosely held by the enzyme and necessary for its biological activity

  4. none of these

Show answer
Correct Option: A
Explanation:

A coenzyme is an organic non-protein compound that binds with an enzyme to catalyze a reaction. A coenzyme cannot function alone, but can be reused several times when paired with an enzyme. Without coenzymes or cofactors, enzymes cannot catalyze reactions effectively.

Pick out the one which does not belong to the family of enzymes.

chemistry biochemistry enzymes and hormones hormones coordination in human beings- chemical control

  1. Lipase

  2. Pepsin

  3. Ptylin

  4. Cellulose

Show answer
Correct Option: D
Explanation:

Cellulose is the carbohydrate which is not considered as enzyme.
Hence option D is correct.