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

Fats are __________.

  1. body building foods

  2. energy bank of the foods

  3. inorganic compounds

  4. fibrous components of the diet

  5. needed for repair of tissues
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Fats are rich in energy and are thus, called the energy bank of the foods.

Multiple choice

The calorific values of carbohydrates, proteins and fats respectively are

  1. 4.1 k cal/g, 5.65 k cal/g and 9.45 k cal/g

  2. 5.65 k cal/g, 10 k cal/g and 2.3 kcal/g

  3. 3.1 k cal/g, 9 k cal/g and 6 k cal/g

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

Carbohydrates provide 4.1 kcal/g, proteins provide 5.65 kcal/g, and fats provide 9.45 kcal/g. This explains why fats are the most energy-dense macronutrients at over twice the caloric density of carbohydrates. Option D is incorrect as these are standard physiological fuel values.

Multiple choice

Which of the following statements are incorrect?

a. The chemical digestion of food is brought about by enzymes. b. Proteins are converted into amino acids after digestion. c. Fats are converted into fatty acids and glycerol. d. Glucose, fatty acids, amino acids and glycerol are water soluble molecules.

  1. a and b

  2. a, b and c

  3. b, c and d

  4. a, b and d

  5. All of the above
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct answer as all the statements are correct.

Multiple choice

In which of the following conditions it is said that certain types of lipids and proteins are essential?

  1. When a cell cannot synthesize them and dies in their absence.

  2. When cell needs them badly, and synthesizes them on its own.

  3. When cell needs them and obtains them from the diet.

  4. When cell needs them and obtains them from adjacent cells.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

  These are not synthesized in the cell so, the cell has to obtain them from the food.

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.