Biology · Chemistry

Lipids, Fats, and Biochemistry

1,130 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

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.

Multiple choice

Which of the following pairs is incorrectly matched?

  1. Siponimod - investigational drug for multiple sclerosis

  2. Resolvin - lipid which possesses a sulphur-containing functional group

  3. Galactolipid - type of glycolipid whose sugar group is galactose

  4. Phospholipid - consists of two hydrophobic fatty acids and a hydrophilic phosphate

  5. Saccharolipid - fatty acid linked directly to a sugar backbone
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This option is correct. Resolvin is a metabolite of the polyunsaturated omega-3 fatty acids, whereas saulpholipid is a lipid which possesses a sulphur-containing functional group.

Multiple choice

The triglycerides of higher saturated fatty acids are classified as

  1. fats

  2. oils

  3. waxes

  4. cholesterol
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The triglycerides are esters of glycerol with long chain fatty acids. Fatty acids always have an even number of carbons and may be saturated e.g, palmitic acid (C15H31COOH) and stearic acid (C17H35COOH) or unsaturated e.g., oleic acid (C17H33COOH) and linolenic acid (C17H29COOH). The three fatty acids in triglycerides may be same or different. Fats are glycerides of saturated fatty acids e.g., triplamitin and tristearin.

Multiple choice

Example of sterol of higher animals is

  1. phospholipids

  2. waxes

  3. glycerides

  4. cholesterol
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cholesterol is a constituent of membrane structure and it synthesizes bile acids, hormones and vitamin D. It is the principal sterol of higher animals, abundant in nerve tissues and gallstones.

Multiple choice

Within the body the fats are emulsified by

  1. cholesterol

  2. triacyl glycerols

  3. phospholipids

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

Phospholipids are used as detergents to emulsify fat for transport within the body. They act as cellular metabolic regulators.They protect internal organs, serve as insulating materials and give shape and smoothness to the body.They serve as a source of fat soluble vitamins.