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

Hydrolysis of fats gives

  1. oxalic acid

  2. ethyl alcohol

  3. acetic acid

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

Hydrolysis of fats (triglycerides) in the presence of an alkali or enzyme produces glycerol and fatty acids. This process is known as saponification when using a base.

Multiple choice

In ageing there is

  1. decrease in cholesterol level

  2. increase in calcium content of arteries and cartilage

  3. decrease in calcium content of arteries and cartilage

  4. decrease in blood urea
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

As part of the aging process, calcium deposits often accumulate in the walls of arteries (arteriosclerosis) and cartilage, leading to increased stiffness.

Multiple choice

Coacervates are

  1. lipoproteins

  2. mixtures of ammonia, carbohydrates and water

  3. colloidal suspensions

  4. fatty acids and nitrogenous compounds
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Coacervates are spherical aggregates of organic molecules (like proteins and polysaccharides) held together by electrostatic forces, forming colloidal droplets in an aqueous environment. They are considered potential precursors to protocells.

Multiple choice

A pound of butter contains more usable energy than a pound of sugar for a human, because

  1. sugar contains much more water than butter

  2. a fat molecule has more carbon hydrogen bonds than a sugar molecule

  3. butter is an animal product, whereas the sugar is a plant product

  4. there is much more waste in digestion and absorption of sugar than of butter
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

 A pound of butter contains more usable energy than a pound of sugar for a human, because a fat molecule has more carbon hydrogen bonds than a sugar molecule.

Multiple choice

The largest part of most diets is made up of

  1. carbohydrates

  2. proteins

  3. lipids

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

The largest part of most diets is made up of carbohydrates. They are the most important source of energy for your body.

Multiple choice

Which of the following is regarded as main cellular fuel?

  1. Protein

  2. Fat

  3. Fructose

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

 Glucose is regarded as main cellular fuel.It is used as an energy source in most organisms, from bacteria to humans, through either aerobic respiration, anaerobic respiration, or fermentation.

Multiple choice

What is rancidification?

  1. Chemical decomposition of fats and other lipids

  2. Oxidation of carbohydrates

  3. Rusting of metals

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The correct answer is option (1).