Biology ยท 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 is a polyunsaturated fatty acid?

  1. Myristic acid

  2. Elaidic acid

  3. Linoleic acid

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

Polyunsaturated fatty acids have more than one double bond between carbon atoms. Linoleic acid is a polyunsaturated fatty acid with 18 carbon atoms and two double bonds.

Multiple choice

What is the general formula for a polyunsaturated fatty acid?

  1. $CH_3(CH_2)_{n-2}COOH$
  2. $CH_3(CH_2)_{n-1}COOH$
  3. $CH_3(CH_2)_{n}COOH$
  4. $CH_3(CH_2)_{n+1}COOH$
Reveal answer Fill a bubble to check yourself
Correct answer
Explanation

The general formula for a polyunsaturated fatty acid is $CH_3(CH_2){n-6}CH=CHCH_2CH=CH(CH_2){m}COOH$, where n is the number of carbon atoms in the chain before the first double bond, and m is the number of carbon atoms in the chain after the last double bond.

Multiple choice

Which of the following is an omega-3 fatty acid?

  1. Palmitic acid

  2. Oleic acid

  3. Linoleic acid

  4. Alpha-linolenic acid
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Omega-3 fatty acids have their last double bond three carbon atoms from the methyl end of the molecule. Alpha-linolenic acid is an omega-3 fatty acid with 18 carbon atoms and three double bonds.

Multiple choice

What is the general formula for an omega-3 fatty acid?

  1. $CH_3(CH_2)_{n-3}CH=CHCH_2CH=CH(CH_2)_{m}COOH$
  2. $CH_3(CH_2)_{n-2}CH=CHCH_2CH=CH(CH_2)_{m}COOH$
  3. $CH_3(CH_2)_{n-1}CH=CHCH_2CH=CH(CH_2)_{m}COOH$
  4. $CH_3(CH_2)_{n}CH=CHCH_2CH=CH(CH_2)_{m}COOH$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The general formula for an omega-3 fatty acid is $CH_3(CH_2){n-3}CH=CHCH_2CH=CH(CH_2){m}COOH$, where n is the number of carbon atoms in the chain before the first double bond, and m is the number of carbon atoms in the chain after the last double bond.

Multiple choice

Which of the following is an omega-6 fatty acid?

  1. Palmitic acid

  2. Oleic acid

  3. Linoleic acid

  4. Alpha-linolenic acid
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Omega-6 fatty acids have their last double bond six carbon atoms from the methyl end of the molecule. Linoleic acid is an omega-6 fatty acid with 18 carbon atoms and two double bonds.

Multiple choice

What is the general formula for an omega-6 fatty acid?

  1. $CH_3(CH_2)_{n-6}CH=CHCH_2CH=CH(CH_2)_{m}COOH$
  2. $CH_3(CH_2)_{n-5}CH=CHCH_2CH=CH(CH_2)_{m}COOH$
  3. $CH_3(CH_2)_{n-4}CH=CHCH_2CH=CH(CH_2)_{m}COOH$
  4. $CH_3(CH_2)_{n-3}CH=CHCH_2CH=CH(CH_2)_{m}COOH$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The general formula for an omega-6 fatty acid is $CH_3(CH_2){n-6}CH=CHCH_2CH=CH(CH_2){m}COOH$, where n is the number of carbon atoms in the chain before the first double bond, and m is the number of carbon atoms in the chain after the last double bond.

Multiple choice

Which of the following is a trans fatty acid?

  1. Palmitic acid

  2. Oleic acid

  3. Elaidic acid

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

Trans fatty acids are formed when unsaturated fatty acids are hydrogenated, a process that converts some of the cis double bonds to trans double bonds. Elaidic acid is a trans fatty acid with 18 carbon atoms and one trans double bond.

Multiple choice

Which of the following is an essential fatty acid?

  1. Palmitic acid

  2. Oleic acid

  3. Linoleic acid

  4. Alpha-linolenic acid
Reveal answer Fill a bubble to check yourself
Correct answer
Explanation

Essential fatty acids are fatty acids that cannot be synthesized by the body and must be obtained from the diet. Linoleic acid and alpha-linolenic acid are essential fatty acids.

Multiple choice

What are the two main types of essential fatty acids?

  1. Omega-3 and Omega-6

  2. Saturated and Unsaturated

  3. Monounsaturated and Polyunsaturated

  4. Trans and Cis
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The two main types of essential fatty acids are omega-3 and omega-6 fatty acids.

Multiple choice

Which of the following is a function of fatty acids?

  1. Energy storage

  2. Cell membrane structure

  3. Hormone production

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Fatty acids have a variety of functions in the body, including energy storage, cell membrane structure, and hormone production.

Multiple choice

Which type of fat is considered to be 'healthy' and should be included in an athlete's diet?

  1. Saturated fats

  2. Trans fats

  3. Monounsaturated fats

  4. Polyunsaturated fats
Reveal answer Fill a bubble to check yourself
Correct answer
Explanation

Monounsaturated and polyunsaturated fats are considered to be 'healthy' fats and should be included in an athlete's diet. They can help reduce the risk of heart disease and provide energy.

Multiple choice

Which macronutrient is responsible for storing energy and insulating the body?

  1. Carbohydrates

  2. Proteins

  3. Fats

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

Fats are responsible for storing energy and insulating the body because they are stored in adipose tissue, which is a type of connective tissue that is made up of fat cells.

Multiple choice

Soybean oil is primarily composed of which fatty acids?

  1. Linoleic acid

  2. Oleic acid

  3. Palmitic acid

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

Soybean oil is rich in linoleic acid, an essential fatty acid that cannot be synthesized by the human body.

Multiple choice

Soybean oil is a valuable ingredient in cosmetics and personal care products primarily due to its:

  1. Moisturizing properties

  2. Antioxidant content

  3. Emulsifying abilities

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Soybean oil is prized in cosmetics for its moisturizing properties, antioxidant content, and emulsifying abilities, making it suitable for a wide range of skincare and hair care products.

Multiple choice

In the pharmaceutical industry, soybean oil is primarily used as:

  1. A carrier oil for injections

  2. An excipient in tablet formulations

  3. A solvent for drug extraction

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Soybean oil finds applications in the pharmaceutical industry as a carrier oil for injections, an excipient in tablet formulations, and a solvent for drug extraction due to its biocompatibility and stability.