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Questions and Answers
Which element is the most predominant and versatile element of life?
Which element is the most predominant and versatile element of life?
- Nitrogen
- Carbon (correct)
- Oxygen
- Hydrogen
Which of the following elements are functionally important and found in cells?
Which of the following elements are functionally important and found in cells?
- Ca, K, Na, Cl, Mg, Fe, Cu, Co, I, Zn, F
- Ca, K, Na, Cl, Mg, Fe, Cu, Co, I, Zn, F, Mo
- Ca, K, Na, Cl, Mg, Fe, Cu, Co, I, Zn
- Ca, K, Na, Cl, Mg, Fe, Cu, Co, I, Zn, F, Mo, and Se (correct)
Which elements together constitute about 90% of the dry weight of the human body?
Which elements together constitute about 90% of the dry weight of the human body?
- Carbon, hydrogen, oxygen, nitrogen, and phosphorus
- Carbon, hydrogen, oxygen, nitrogen, phosphorus, and sulfur (correct)
- Carbon, hydrogen, oxygen, nitrogen, and sulfur
- Carbon, hydrogen, oxygen, phosphorus, and sulfur
How many different organic compounds are found in a single cell of the bacterium, Escherichia coli?
How many different organic compounds are found in a single cell of the bacterium, Escherichia coli?
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Approximately how many different types of molecules are believed to be present in the human body?
Approximately how many different types of molecules are believed to be present in the human body?
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Study Notes
Elements of Life
- Carbon is the most predominant and versatile element of life.
Functionally Important Elements
- Oxygen, carbon, nitrogen, and hydrogen are functionally important and found in cells.
Human Body Composition
- Oxygen, carbon, nitrogen, and hydrogen together constitute about 90% of the dry weight of the human body.
Organic Compounds in Bacteria
- A single cell of the bacterium Escherichia coli contains approximately 4,000 different organic compounds.
Molecules in the Human Body
- The human body is believed to contain around 10,000 to 15,000 different types of molecules.
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