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 biology a healthy diet minerals and vitamins nutrition and diet role of various nutrients

Lipids are generally

  1. A high energy source

  2. Hydrophobic

  3. Composed of fatty acids

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

Lipids are a group of naturally occurring molecules that include fats, waxes, sterols, fat-soluble vitamins (such as vitamins A, D, E, and K), monoglycerides, diglycerides, triglycerides, phospholipids, and others. They are the most calorigenic among the biomolecules. Chemically lipids are hydrophobic.

Multiple choice biology a healthy diet minerals and vitamins nutrition and diet role of various nutrients

Predominant form of lipid present in biomembranes

  1. Free fatty acids

  2. Cholesterol

  3. Triacylglycerols

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

The predominant lipids present in the biomembrane are phospholipids, having a polar water soluble phosphorous head and a non polar long aliphatic tail. The polar head is exposed on the surface while the hydrophobic tail remains buried inside.

Multiple choice physics the essence of change forms of energy and energy conservation energy for everything forms of energy

The energy stored in food is :

  1. Electrical

  2. Heat

  3. Chemical

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

 chemical energy is the potential of a chemical substance to undergo a transformation through a chemical reaction to transform other chemical substances.

heat energy is due to temperature.
in food different different reaction occurs which provide energy to run the body, so energy possessed in food is chemical energy.
option C.

Multiple choice biology multicellular structure: tissue defense mechanism in plants epidermal tissue system kinds of plant tissue permanent tissues and their types

Fatty substance found in epidermal cell walls is

  1. Cutin

  2. Suberin

  3. Both B and C

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

The cuticle is the waxy layer present on the epidermis of the leaf which curtails the rate of water loss by transpiration in certain higher plants. 
Cutin is especially noticeable in many fruits, e.g., apple, nectarine, and cherry, which can be buffed to a high gloss. Carnauba wax is derived from the cuticles of the leaves of Copernicia cerifera, a Brazilian palm.
Suberin is the inert waxy substance which is present in the cell wall of cork tissue.

Thus, the correct answer is option A.

Multiple choice biology blood circulatory system of human blood clotting platelets and their function defence against infectious disease

How many of the following nutrients, follow fol-lowing route of absorption
Blood capillaries $\rightarrow$ Mesentric vein $\rightarrow$ Hepatic portal vein $\rightarrow$ Liver $\rightarrow$ Hepatic vein $\rightarrow$ IVC $\rightarrow$ Heart $\rightarrow$ Body
(i) Glucose
(ii) Galactose
(iii) Fructose
(iv) L-amino acids
(v) D-amino acids
(vi) Long chain fatty acids.

  1. Six

  2. Five

  3. Only one

  4. Three.
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice biology health and hygiene minerals and vitamins nutrition and diet role of various nutrients

Which of the following is an example of an ester?

  1. Fats

  2. Oils

  3. Starch

  4. Both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Lipids (fats and oils) are compounds of carbon, hydrogen and oxygen where ratio of hydrogen and oxygen is less than that of the water. Lipids are esters of fatty acids and alcohol which form emulsion with water but are soluble in organic solvents. They are esters of three molecules of fatty acids and one molecule of trihydric alcohol glycerol, e.g., ghee, butter, cholesterol, carotene, eucalyptus oil. 

Multiple choice biology health and hygiene minerals and vitamins nutrition and diet role of various nutrients

Our hair and nails are composed of _________.

  1. Carbohydrates

  2. Proteins

  3. Vitamins

  4. Fat
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Hair and nails are made up of dead squamous cells which are called as keratinocytes. It consists of a protein known as keratin and is present in hair, nails and skin. It helps in protection as composed of intact cells.
So, the correct answer is 'Proteins'.
Multiple choice biology multicellular structure: tissue muscle tissue structure of protein muscle tissues

Phosphagen in vertebrates is

  1. Phospho creatine

  2. Phospho arginine

  3. ATP

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

The phosphagens are energy storage compounds, also known as high-energy phosphate compounds. They are chiefly found in muscular tissue in animals. ATP molecules can provide energy for only a few seconds of strenuous muscular activity. Thus muscle cells have backup energy storage compound, creatine phosphate, that can be stockpiled. The energy stored in creatine phosphate is transferred to ATP as needed. But during vigorous exercise, the supply of creatine phosphate is quickly depleted. Muscle cells must replenish their supplies of these energy-rich compounds. Chemical energy is stored in muscle fibers in glycogen, a large polysaccharide formed from hundreds of glucose molecules. Glycogen can be degraded, yielding glucose, which is then degraded in cellular respiration. When sufficient oxygen is available, enough energy is captured from glucose to produce needed quantities of ATP and creatine phosphate.

Multiple choice botany male & female gametophytes: structure and development pollen grain androecium male gametophyte

Chemically pollen kitt is made up of lipids and carotenoids.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pollen kitt is a sticky covering found on the surface of pollen grains. It is common in plants that are pollinated by insects. It is composed of lipids and carotenoids and is formed by tapetum. Pollen kitt helps in pollination. Hence, chemically pollen kitt is made up of lipids and carotenoids.

So, the correct answer is 'Lipids and carotenoids'.

Multiple choice botany male & female gametophytes: structure and development pollen grain androecium male gametophyte

Sporopollenin is formed by the polymerization of

  1. Fat and phenols

  2. Fats and esters

  3. Carotenoids and fat

  4. Carotenoid and esters
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Sporopollenin is composed of carbon, hydrogen, and oxygen, though the exact chemical composition is not known, due to its unusual chemical stability and resistance to degradation by enzymes and strong chemical reagents. Analyses have revealed a mixture of biopolymers, containing mainly long chain fatty acids, phenylpropanoids, phenolics and traces of carotenoids. 
So the correct option is 'Fats and phenols'.
Multiple choice biology reproduction in higher plants growth and development in plants sexual reproduction in plants post fertilization - plants

Maximum fats is present in seeds of

  1. Arachis hypogea

  2. Oryza sativa

  3. Cicer arietinum

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

The peanut or groundnut (Arachis hypogaea) is a species in the family Fabaceae. Peanuts can be eaten raw, used in recipes, made into oils, textile materials and peanut butter as well as many other uses. In general, peanut products are considered safe for human use, although there are insufficient studies about peanut aflatoxins and uses for cosmetics. Peanut oil is often used in cooking, because it has a mild flavour and a relatively high smoke point. Due to its high monounsaturated content, it is considered healthier than saturated oils and is resistant to rancidity.
There are several types of peanut oil including aromatic roasted peanut oil, refined peanut oil, extra virgin or cold pressed peanut oil and peanut extract.
In the United States, refined peanut oil is exempt from allergen labelling laws. This oil is obtained from seeds of Arachis hypogea. Oryza sativa is rich in carbohydrates. Cicer arietinum is rich in proteins. Hibiscus esculentus (okra) seeds does not contains fats. 
Thus, the correct answer is option A.

Multiple choice biology soldiers of defense human lymphatic system lymph and its function lymph and tissue fluid

Which of the following molecule enters into the lymph from intestine?

  1. Fat molecules

  2. Glycerols

  3. Plasma protein

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Chyle is the liquid form of chyme that enters lymph vessels from the small intestine. It is rich in fats, these fats along with lymph often appear as milk. The fat molecules from the intestine will make their way into the lymph.
  • Glycerols also called as glycerine is a colorless, odorless substance. It is found as an intermediate in metabolic pathways.
  • Plasma protein is the proteins that make-up blood plasma. They help in maintaining osmotic pressure, clotting, and transport of certain lipids, enzymes and hormones.
So the correct option is "Fat molecules".