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

In the context of human physiology, antibodies are-

  1. Carbohydrates

  2. Glycolipids

  3. Proteins

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

Antibodies, also known as immunoglobulins, are large, Y-shaped proteins produced by plasma cells that are used by the immune system to neutralize pathogens. They are not carbohydrates, lipids, or sterols. Their specific structure allows them to bind to specific antigens on the surface of bacteria or viruses.

Multiple choice

The important organic molecules of living cells include

  1. carbohydrates

  2. proteins and lipids

  3. nucleic acids

  4. all of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Living cells rely on a variety of organic molecules to function, including carbohydrates for energy, proteins and lipids for structure and function, and nucleic acids for genetic information. Therefore, all these categories are essential.

Multiple choice

Biodiesel is produced from the oily seeds of

  1. Sunflower

  2. Soyabean

  3. Jatropha

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

Jatropha curcas is a plant widely promoted for biodiesel production because its seeds contain high levels of oil that can be processed into fuel.

Multiple choice

The fatty acid found in cerebroside is

  1. gamma-linolenic acid

  2. stearidonic acid

  3. α-linolenic acid

  4. lignoceric acid

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

Lignoceric acid is a saturated fatty acid.

Multiple choice

Which of the following statements does NOT characterise triglycerides?

  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

  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

What 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.