Q. What is the pH of human blood?
-
A.
6.8-7.2
-
B.
7.35-7.45
-
C.
7.5-7.8
-
D.
8.0-8.5
Solution
The normal pH range of human blood is 7.35 to 7.45.
Correct Answer:
B
— 7.35-7.45
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Q. What is the pH range of pure water at 25°C?
-
A.
0-3
-
B.
4-6
-
C.
7
-
D.
8-10
Solution
Pure water has a neutral pH of 7 at 25°C.
Correct Answer:
C
— 7
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Q. What is the role of buffers in biological systems?
-
A.
Increase pH
-
B.
Decrease pH
-
C.
Maintain stable pH
-
D.
Change pH rapidly
Solution
Buffers help maintain a stable pH in biological systems by neutralizing acids and bases.
Correct Answer:
C
— Maintain stable pH
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Q. What type of bond is primarily responsible for the unique properties of water?
-
A.
Ionic bonds
-
B.
Covalent bonds
-
C.
Hydrogen bonds
-
D.
Van der Waals forces
Solution
Hydrogen bonds are responsible for many of water's unique properties, including its high surface tension.
Correct Answer:
C
— Hydrogen bonds
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Q. Which macromolecule is involved in the storage of genetic information?
-
A.
Proteins
-
B.
Nucleic acids
-
C.
Carbohydrates
-
D.
Lipids
Solution
Nucleic acids, such as DNA and RNA, are responsible for storing and transmitting genetic information.
Correct Answer:
B
— Nucleic acids
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Q. Which macromolecule is primarily responsible for the structure of cell membranes?
-
A.
Proteins
-
B.
Nucleic acids
-
C.
Carbohydrates
-
D.
Lipids
Solution
Lipids, particularly phospholipids, form the structural basis of cell membranes.
Correct Answer:
D
— Lipids
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Q. Which macromolecule serves as the primary source of energy for cells?
-
A.
Proteins
-
B.
Nucleic acids
-
C.
Carbohydrates
-
D.
Lipids
Solution
Carbohydrates are the primary source of energy for cells.
Correct Answer:
C
— Carbohydrates
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Q. Which of the following is a property of water that is crucial for life?
-
A.
High density
-
B.
Low specific heat
-
C.
Universal solvent
-
D.
Inert nature
Solution
Water is known as the universal solvent due to its ability to dissolve many substances.
Correct Answer:
C
— Universal solvent
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Q. Which of the following macromolecules can act as enzymes?
-
A.
Carbohydrates
-
B.
Lipids
-
C.
Proteins
-
D.
Nucleic acids
Solution
Proteins can act as enzymes, catalyzing biochemical reactions.
Correct Answer:
C
— Proteins
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