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

A company marketing food products advertises that its items do not contain trans-fats. What does this campaign signify to the customers?

  1. The food products are not made out of hydrogenated oils.
  2. The food products are not made out of animal fats/oils.
  3. The oils used are not likely to damage the cardiovascular health of the consumer.

Which of the statements given above is/ correct?

  1. 1 only

  2. 2 and 3 only

  3. 1 and 3 only

  4. 1, 2 and 3
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Many of the random compounds created when oils are hydrogenated are "trans fats". These are unnatural compounds, which are known to be detrimental to cardiovascular health. On the other hand animal fats are relatively good for health.

Multiple choice

If the ester bonds of a triacylglycerol molecules are broken, what kind of water soluble molecule will be formed?

  1. Fatty acid

  2. Steroid

  3. Glycogen

  4. Glycerol

  5. Amylopectin
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Glycerol is a simple polyol (sugar alcohol) compound. It is a colorless, odorless, viscous liquid that is widely used in pharmaceutical formulations. Glycerol has three hydroxyl groups that are responsible for its solubility in water and its hygroscopic nature.

Multiple choice

Which heteropolysaccharide serves as lubricant in the synovial fluid of the joints?

  1. Heparin

  2. Peptidoglycan

  3. Hyaluronate

  4. Heparan sulphate

  5. Proteoglycans
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The glycosaminoglycans hyaluronic acid(hyaluronate at physiological pH)contains alternating residues of D-glucoronic acid and N-acetyl glucosamine. Hyaluronates  have molecular weights grater than 1 million, they form clear, highly viscous solutions.

Multiple choice

Which of the given compounds can play an important role in keeping lipids in solution and transporting them to the brush border of the intestinal epithelial cells?

  1. Cholagogues

  2. Micelles

  3. Cholecystokinin

  4. Lecithin

  5. Cholesterol
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The free fatty acids and monoglycerides form micelles that migrate towards the brush border membrane. The micelle permits fat components to be soluble in water. Because bile salts have a hydrophobic or water repelling region and a hydrophilic or water attracting region, the micelle is formed with bile salts arranged around the outside with hydrophobic ends facing inside and hydrophobic fatty acids, monoglycerides, phospholipids and cholesterol as well as the fat soluble vitamins A, D, E and K in the centre.

Multiple choice plant kingdom biology

Laminarin and mannitol, the reserve food of brown algae, are

  1. lipids

  2. complex carbohydrates

  3. proteins

  4. lipoproteins
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The food in the members of Phaeophyceae is stored as complex carbohydrates in the form of laminarin or mannitol.

Multiple choice

What molecule is produced when lipids break down?

  1. ATP

  2. DNA

  3. Starch

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

Lipids are broken down into fatty acids and glycerol, which then enter metabolic pathways to produce ATP, the primary energy currency of the cell.