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 type of lipids are carotenoids?

  1. Sterol lipids

  2. Prenol lipids

  3. Sphingolipids

  4. Glycerolipids

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

Prenol lipids are synthesised from the five-carbon-unit precursors isopentenyl diphosphate and dimethylallyl diphosphate. Carotenoids are important simple isoprenoids that function as antioxidants and as precursors of vitamin A.

Multiple choice

The enzyme cytochrome c oxidase is a large transmembrane protein complex found in bacteria and the mitochondrion of eukaryotes.

  1. Human brain cannot utilise fatty acids as an energy source.

  2. Liver cells can synthesise and store triglycerides.

  3. The triglycerides form chylomicrons.

  4. The process lipolysis takes place in the intestine.

  5. In triglyceride form, lipids cannot be absorbed by jejunum.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

In triglyceride form, lipids cannot be absorbed by the duodenum.

Multiple choice

Which of the following statements does NOT characterise unsaturated fats?

  1. Meat products contain both saturated and unsaturated fats.

  2. Replacing saturated fats with unsaturated fats helps to lower the levels of total cholesterol in human beings.

  3. Unsaturated chains have a lower melting point.

  4. Unsaturated fats are popular with manufacturers of processed foods.

  5. Double bonds may be either in a cis or a trans isomer.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Saturated fats are popular with manufacturers of processed foods.

Multiple choice

The fatty acid found in seeds and nuts is called

  1. α-linolenic acid

  2. dihomo-γ-linolenic acid

  3. eicosapentaenoic acid

  4. linoleic acid

  5. gamma-linolenic acid
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

α-Linolenic acid is an essential omega-3 fatty acid found in seeds, nuts and many common vegetable oils.

Multiple choice

Butter is a common source of

  1. elicosanoic acid

  2. dodecanoic acid

  3. butanoic acid

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

Butter is a common source of butanoic acid. It has an unpleasant smell and acrid taste, with a sweetish aftertaste similar to ether.

Multiple choice

Which of the following oils has the least iodine number?

  1. Palm oil

  2. Coconut oil

  3. Tung oil

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

Coconut oil has the least iodine number. It is 7-12. Iodine numbers determine the amount of unsaturation in fatty acids. Coconut oil is very saturated and thus, has less iodine number.