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

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.

Multiple choice

Which among the following is good cholesterol?

  1. VLDL

  2. HDL

  3. LDL

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

High-density lipoprotein (HDL) is known as good cholesterol because it helps remove other forms of cholesterol from the bloodstream, transporting it to the liver for excretion.

Multiple choice

Lipid containing proteins are important constituents of all biological membranes. They are known as:

  1. Glyco-proteins

  2. Lipo-proteins

  3. Nucleo-proteins

  4. Chromo-proteins

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Lipo-proteins  have lipids bound to proteins. Lipo-proteins are important constituents of all biological membranes : plasma membrane, membranes of the endoplasmic reticulum, lysosome, Golgi complex, mitochondria, nuclear envelope and the chloroplasts. They also occur as lipovitellin, a storage product in egg yolk.

Multiple choice

Directions: The given conversation has the sentences mixed up. Re-order them correctly

(a) It is used by the body to build cell walls and essential hormones. (b) Cholesterol is carried through the blood by particles called lipoproteins. (c) But it is also found in the animal fats which one eats. (d) Cholesterol is produced by liver.

  1. D C B A

  2. D B C A

  3. D C A B

  4. C B A O
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Option 1 presents the correct sequence of the sentences

Multiple choice

Main components of plasma membrane are ________ .

  1. proteins only

  2. lipids only

  3. both proteins and lipids

  4. carbohydrates

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The plasma membrane is primarily composed of a lipid bilayer embedded with various proteins, often described by the fluid mosaic model.

Multiple choice

Instantaneous source of energy is/are

  1. amino acids

  2. fats

  3. glucose

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

Glucose is a monosaccharide that enters glycolysis directly, making it the most readily available and instantaneous source of energy for cellular respiration.