All organic compounds in the human body contain all of the following elements except
(a) Hydrogen
(b) Oxygen
(c) Carbon
(d) Calcium
(e) Both a and d

검증된 단계별 안내

Understand that organic compounds are primarily defined by the presence of carbon atoms bonded to hydrogen atoms, often along with oxygen and other elements.

Recall the common elements found in organic molecules such as carbohydrates, lipids, proteins, and nucleic acids, which typically include carbon (C), hydrogen (H), and oxygen (O).

Recognize that calcium (Ca) is a mineral element important in the body but is not a component of organic compounds; it is usually found in inorganic compounds like bones and teeth.

Analyze each option: hydrogen (a), oxygen (b), and carbon (c) are all elements found in organic compounds, while calcium (d) is not.

Conclude that the element not found in all organic compounds is calcium, so the correct answer is the option that includes calcium.

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주요 개념

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Elements in Organic Compounds

Organic compounds primarily consist of carbon atoms bonded with hydrogen, oxygen, nitrogen, and other elements. Carbon's ability to form four covalent bonds makes it the backbone of organic molecules, while hydrogen and oxygen are common in functional groups like hydroxyl and carboxyl.

Role of Calcium in the Human Body

Calcium is a vital mineral mainly found in bones and teeth, providing structural support. It is not a component of organic compounds but exists as an inorganic element essential for physiological functions like muscle contraction and nerve signaling.

Distinguishing Organic vs. Inorganic Elements

Organic compounds contain carbon and typically hydrogen and oxygen, forming molecules like carbohydrates, lipids, proteins, and nucleic acids. Elements like calcium are inorganic and do not form the molecular framework of organic compounds, though they are crucial for biological processes.

All organic compounds in the human body contain all of the following elements except(a) Hydrogen(b) Oxygen(c) Carbon(d) Calcium(e) Both a and d