Biology · Chemistry

Lipids, Fats, and Biochemistry

1,009 Questions

Lipids, fats, and biochemistry explore the structure and function of biological molecules. This includes fatty acids, cholesterol, trans-fats, and cellular membranes. Questions on this topic frequently appear in science sections of competitive government exams.

Types of fats and lipidsCholesterol and human bodyFatty acidsCellular membranes

Lipids, Fats, and Biochemistry Questions

Multiple choice

R.Q. of fatty substances is generally

  1. zero

  2. unity

  3. more than one

  4. less than one
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Fatty substances are highly reduced and require more oxygen for complete oxidation relative to the CO2 produced, resulting in an RQ value less than 1 (typically around 0.7).

Multiple choice

What forms the largest part of most diets?

  1. Nucleic acid

  2. Proteins

  3. Carbohydrates

  4. Lipids
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Carbohydrates are the primary source of energy and form the largest part of most human diets, providing the bulk of daily caloric intake.

Multiple choice

Coacervates are

  1. lipoproteins

  2. mixtures of ammonia, carbohydrates and water

  3. colloidal suspensions

  4. fatty acids and nitrogenous compounds
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Coacervates are colloidal suspensions.Oparin’s work with coacervates confirmed that enzymes fundamental for the biochemical reactions of metabolism functioned more efficiently when contained within membrane-bound spheres than when free in aqueous solutions.

Multiple choice

In ageing, there is

  1. decrease in cholesterol level

  2. increase in calcium content of arteries and cartilage

  3. decrease in calcium content of arteries and cartilage

  4. decrease in blood urea
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In ageing, there is increase in calcium content of arteries and cartilage.

Multiple choice

Which of the following statements is/are false about 2-arachidonyl glyceryl ether?

P. It is a reputed endocannabinoid that was discovered by Lumír Hanus. Q. The production of this endocannabinoid is enhanced in normal rat aorta on reacting with carbachol. R. It potently enhances the blood pressure in rats and represents an endothelium-derived hypotension factor.

  1. Only P

  2. Only Q

  3. Only R

  4. Only P and Q

  5. Only Q and R
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

It potently reduces blood pressure in rats and represents an endothelium-derived hypotension factor.

Multiple choice

Which of the following pairs is/are incorrectly matched?

  1. Sphingomyelin - helps in cellular growth and detection of unhealthy cells
  2. Phosphatidylethanolamine - comprises the backbone of cell membranes and contributes to the fluidity and structural environment of the cell
  3. Phosphatidylserine - positive effect on memory and helps maintain cholesterol level

  1. Only 1

  2. Only 2

  3. Only 3

  4. Only 1 and 2

  5. Only 2 and 3
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This option is correct. Phosphatidylserine stimulates the production of a brain messenger chemical that helps regulate memory by increasing the availability of glucose in the brain.

Multiple choice

Which of the following amino lipids occurs naturally in the body of animals that accumulates in the cerebrospinal fluid during sleep deprivation and induces sleep in animals?

  1. 1,2-Dioleoyl-sn-glycerophosphoethanolamine

  2. Oleamide

  3. Palmitoylcarnitine

  4. N-Acylethanolamine

  5. Arachidonyl-2'-chloroethylamide
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This option is correct. Oleamide occurs naturally in the body of animals that accumulates in the cerebrospinal fluid during sleep deprivation and induces sleep in animals.

Multiple choice

Match the following:

 
List I List II
(i) Linoleic acid a. Saturated fatty acid containing cyclopentane ring
(ii) Palmitoleic acid b. Saturated fat
(iii) Lauric acid c. Monounsaturated fat
(iv) Prostanoic acid d. Polyunsaturated fat

  1. (i) - d, (ii) - c, (iii) - b, (iv) - a

  2. (i) - a, (ii) - c, (iii) - b, (iv) - d

  3. (i) - c, (ii) - d, (iii) - b, (iv) - a

  4. (i) - d, (ii) - b, (iii) - c, (iv) - a

  5. (i) - b, (ii) - d, (iii) - a, (iv) - c
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This option is correct because all lipids are correctly matched with their types.

 

Multiple choice

Which of the following statements is/are correct about sulfoquinovosyl diacylglycerol?

  1. It is a phosphorus-free lipid that is found in many photosynthetic organisms.
  2. It is synthesised from UDP-sulfoquinovose and triacylglycerol.
  3. It degrades during chlorine starvation in some species, such as Chlamydomonas reinhardtii.

  1. Only 1

  2. Only 2

  3. Only 3

  4. Only 1 and 2

  5. Only 2 and 3
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This option is correct. Sulfoquinovosyl diacylglycerol is a phosphorus-free lipid that is found in many photosynthetic organisms.

Multiple choice

Assertion (A): Palmitoylethanolamide cannot strictly be considered as a classic endocannabinoid. Reason (R): It lacks affinity for the cannabinoid receptors CB1 and CB2.

  1. A and R both are correct and R is the correct explanation of A.

  2. A and R both are correct and R is not the correct explanation of A.

  3. A is correct and R is incorrect.

  4. A is incorrect and R is correct.

  5. A and R both are incorrect.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Palmitoylethanolamide cannot strictly be considered as a classic endocannabinoid because it lacks affinity for the cannabinoid receptors CB1 and CB2. Thus, this option is correct.

Multiple choice

Assertion (A): Saturated fats are useful to manufacturers of food preservatives. Reason (R): Various fats contain different proportions of saturated and unsaturated fat.

  1. A and R both are correct and R is the correct explanation of A.

  2. A and R both are correct and R is not the correct explanation of A.

  3. A is correct and R is incorrect.

  4. A is incorrect and R is correct.

  5. A and R both are incorrect.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Correct Answer: A and R both are correct and R is not the correct explanation of A.