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 of the following statements is FALSE regarding cholesterol?

  1. The cholesterol molecule is steroid.

  2. Molecular formula of cholesterol is C27H46O.

  3. Cholesterol circulates in blood stream chiefly as free cholesterol.

  4. Cholesterol serves as a precursor for the biosynthesis bile acids.

  5. Cheese is a major dietary source of cholesterol.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cholesterol circulates in blood stream chiefly as low density lipoproteins (LDL) and high density lipoproteins (HDL).

Multiple choice

Which of the following are amphipathic glycosides?

  1. Polyphenols

  2. Phytosterols

  3. Alkaloids

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

Saponins is a class of chemical compounds, one of many secondary metabolites found in natural sources with saponins found in particular abundance in various plant species. Specifically, these are amphipathic glycosides grouped phenomenologically by the soap-like foaming they produce when shaken in aqueous solutions.

Multiple choice

What are fats and carbohydrates?

Directions: Read the passage given carefully and answer the question that follows.

The diet which contains adequate amount of all the important nutrients like carbohydrates, fats, proteins, minerals and vitamins, sufficient for the normal growth and development of the body is called a balanced diet. The constituents of balanced diet are - Carbohydrates, Fats, Proteins, Minerals (Salts), Vitamins, Water and Roughage, Carbohydrates are the compounds of carbon, hydrogen and oxygen. They are the main source of energy. The fats are the compounds of carbon, hydrogen and oxygen. The main function of fats in the body is to provide a steady source of energy. The proteins are highly complex organic compounds of carbon, hydrogen, oxygen and nitrogen. Proteins are very important for the growth and repair of the body. Kwashiorkor is a disease which occurs due to the deficiency of proteins in the diet of children whereas Marasmus occurs in the infants (small children) due to the deficiency of proteins. The metals, non-metals and their salts are called minerals. Our body needs minerals for its proper functioning.

  1. Compounds of carbon, hydrogen and oxygen

  2. Compounds of carbon and hydrogen

  3. Compounds of carbon and oxygen

  4. Compounds of carbon
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

 According to the passage, "Carbohydrates are the compounds of carbon, hydrogen and oxygen". So, option 1 is the correct answer.

Multiple choice

With reference to human diet, which one of the following is an essential fatty acid?

  1. Butyric Acid

  2. Linoleic Acid

  3. Oleic Acid

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

Linoleic acid (an omega-6 fatty acid) is an essential fatty acid that the human body cannot synthesize and must obtain from dietary sources. It is crucial for various physiological functions including cell membrane structure and production of signaling molecules. Butyric acid, oleic acid, and stearic acid can all be synthesized by the human body and are not essential in the diet.

Multiple choice

Pick the CORRECT statement regarding the major dietary constituents.

  1. The human body cannot store glucose.

  2. All essential amino acids are found in meat.

  3. Plant oils are rich in unsaturated fats.

  4. Normally ketones are found in the urine of a person eating a carbohydrate rich diet.

  5. The urine of a non vegetarian is alkaline in nature.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Animal protein is complete protein and contains all 20 of the amino acids used by the body to synthesize new proteins.

Multiple choice

The white portion of egg is rich in

  1. carbohydrates

  2. proteins

  3. lipids

  4. fats

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

Egg white (albumen) is approximately 90% water and 10% protein, primarily albumin proteins like ovalbumin. It contains no fat, making it a pure protein source.

Multiple choice

Genes control a trait while __________ help in the expression of a trait.

  1. fats

  2. carbohydrates

  3. proteins

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

Genes contain the genetic information (DNA), but proteins are the molecules that actually carry out cellular functions and express traits. Proteins include enzymes that catalyze reactions and structural proteins that build cellular components.