Q. Which biomolecule is primarily responsible for storing genetic information?
-
A.
Proteins
-
B.
Lipids
-
C.
Carbohydrates
-
D.
Nucleic acids
Solution
Nucleic acids, such as DNA and RNA, are responsible for storing and transmitting genetic information.
Correct Answer: D — Nucleic acids
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Q. Which biomolecule is primarily responsible for the genetic information in cells?
-
A.
Proteins
-
B.
Lipids
-
C.
Nucleic acids
-
D.
Carbohydrates
Solution
Nucleic acids, such as DNA and RNA, are responsible for storing and transmitting genetic information.
Correct Answer: C — Nucleic acids
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Q. Which biomolecule is primarily responsible for the storage of genetic information?
-
A.
Proteins
-
B.
Lipids
-
C.
Nucleic acids
-
D.
Carbohydrates
Solution
Nucleic acids, such as DNA and RNA, are responsible for storing and transmitting genetic information.
Correct Answer: C — Nucleic acids
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Q. Which biomolecule is primarily responsible for the structure of cell membranes?
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A.
Proteins
-
B.
Carbohydrates
-
C.
Nucleic acids
-
D.
Lipids
Solution
Lipids, particularly phospholipids, are the main components of cell membranes.
Correct Answer: D — Lipids
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Q. Which biomolecule is used for energy storage in animals?
-
A.
Glycogen
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B.
Cellulose
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C.
Starch
-
D.
Chitin
Solution
Glycogen is the primary form of energy storage in animals.
Correct Answer: A — Glycogen
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Q. Which biomolecule is used for quick energy?
-
A.
Proteins
-
B.
Lipids
-
C.
Carbohydrates
-
D.
Nucleic acids
Solution
Carbohydrates are primarily used for quick energy by living organisms.
Correct Answer: C — Carbohydrates
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Q. Which biomolecule serves as the main component of cell membranes?
-
A.
Proteins
-
B.
Carbohydrates
-
C.
Nucleic acids
-
D.
Phospholipids
Solution
Phospholipids are the main component of cell membranes, forming a bilayer structure.
Correct Answer: D — Phospholipids
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Q. Which bond is primarily responsible for the secondary structure of proteins?
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A.
Ionic bonds
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B.
Hydrogen bonds
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C.
Disulfide bonds
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D.
Peptide bonds
Solution
The secondary structure of proteins, such as alpha-helices and beta-sheets, is stabilized by hydrogen bonds between the backbone atoms.
Correct Answer: B — Hydrogen bonds
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Q. Which carbohydrate is a structural component of plant cell walls?
-
A.
Starch
-
B.
Glycogen
-
C.
Cellulose
-
D.
Fructose
Solution
Cellulose is a polysaccharide that provides structural support in plant cell walls.
Correct Answer: C — Cellulose
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Q. Which carbohydrate is commonly used as a sweetener?
-
A.
Lactose
-
B.
Maltose
-
C.
Fructose
-
D.
Cellulose
Solution
Fructose is commonly used as a sweetener due to its high sweetness level.
Correct Answer: C — Fructose
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Q. Which carbohydrate is found in milk?
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A.
Lactose
-
B.
Maltose
-
C.
Glucose
-
D.
Fructose
Solution
Lactose is the sugar found in milk, composed of glucose and galactose.
Correct Answer: A — Lactose
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Q. Which carbohydrate is found in the structure of DNA?
-
A.
Glucose
-
B.
Ribose
-
C.
Fructose
-
D.
Mannose
Solution
Ribose is the sugar component of RNA, while deoxyribose is found in DNA.
Correct Answer: B — Ribose
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Q. Which carbohydrate is known as blood sugar?
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A.
Galactose
-
B.
Fructose
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C.
Glucose
-
D.
Ribose
Solution
Glucose is commonly referred to as blood sugar as it is the primary energy source for the body's cells.
Correct Answer: C — Glucose
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Q. Which carbohydrate is primarily stored in animal liver and muscle?
-
A.
Cellulose
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B.
Starch
-
C.
Glycogen
-
D.
Fructose
Solution
Glycogen is the carbohydrate primarily stored in animal liver and muscle as a form of energy reserve.
Correct Answer: C — Glycogen
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Q. Which enzyme breaks down starch into glucose?
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A.
Amylase
-
B.
Lactase
-
C.
Sucrase
-
D.
Cellulase
Solution
Amylase is the enzyme that catalyzes the hydrolysis of starch into glucose.
Correct Answer: A — Amylase
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Q. Which enzyme is responsible for the hydrolysis of starch?
-
A.
Amylase
-
B.
Cellulase
-
C.
Lactase
-
D.
Maltase
Solution
Amylase is the enzyme that catalyzes the hydrolysis of starch into sugars.
Correct Answer: A — Amylase
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Q. Which level of protein structure is characterized by the arrangement of multiple polypeptide chains?
-
A.
Primary structure
-
B.
Secondary structure
-
C.
Tertiary structure
-
D.
Quaternary structure
Solution
The quaternary structure of a protein refers to the arrangement and interaction of multiple polypeptide chains.
Correct Answer: D — Quaternary structure
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Q. Which level of protein structure is characterized by the overall 3D shape of a single polypeptide chain?
-
A.
Primary structure
-
B.
Secondary structure
-
C.
Tertiary structure
-
D.
Quaternary structure
Solution
The tertiary structure of a protein refers to the overall 3D shape of a single polypeptide chain, determined by interactions among side chains.
Correct Answer: C — Tertiary structure
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Q. Which of the following amino acids contains a sulfur atom?
-
A.
Cysteine
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B.
Serine
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C.
Glutamine
-
D.
Alanine
Solution
Cysteine is the amino acid that contains a sulfur atom in its side chain, which can form disulfide bonds.
Correct Answer: A — Cysteine
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Q. Which of the following amino acids is essential in the human diet?
-
A.
Glycine
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B.
Alanine
-
C.
Lysine
-
D.
Serine
Solution
Lysine is an essential amino acid that must be obtained through the diet, while glycine, alanine, and serine can be synthesized by the body.
Correct Answer: C — Lysine
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Q. Which of the following biomolecules is primarily responsible for storing genetic information?
-
A.
Proteins
-
B.
Lipids
-
C.
Carbohydrates
-
D.
Nucleic acids
Solution
Nucleic acids, such as DNA and RNA, are responsible for storing and transmitting genetic information.
Correct Answer: D — Nucleic acids
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Q. Which of the following carbohydrates is a disaccharide?
-
A.
Maltose
-
B.
Ribose
-
C.
Cellulose
-
D.
Glycogen
Solution
Maltose is a disaccharide formed from two glucose units.
Correct Answer: A — Maltose
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Q. Which of the following carbohydrates is a ketose?
-
A.
Glucose
-
B.
Fructose
-
C.
Galactose
-
D.
Mannose
Solution
Fructose is a ketose sugar, while glucose and galactose are aldoses.
Correct Answer: B — Fructose
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Q. Which of the following carbohydrates is a reducing sugar?
-
A.
Fructose
-
B.
Sucrose
-
C.
Maltose
-
D.
Cellulose
Solution
Maltose is a reducing sugar because it has a free aldehyde or ketone group, while sucrose does not.
Correct Answer: C — Maltose
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Q. Which of the following carbohydrates is not digestible by humans?
-
A.
Starch
-
B.
Glycogen
-
C.
Cellulose
-
D.
Maltose
Solution
Cellulose is not digestible by humans due to the lack of enzymes to break it down.
Correct Answer: C — Cellulose
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Q. Which of the following is a carbohydrate?
-
A.
Glucose
-
B.
Amino acid
-
C.
Fatty acid
-
D.
Nucleotide
Solution
Glucose is a simple sugar and a primary carbohydrate.
Correct Answer: A — Glucose
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Q. Which of the following is a characteristic of carbohydrates?
-
A.
High energy density
-
B.
Soluble in organic solvents
-
C.
Hydrophilic nature
-
D.
Insoluble in water
Solution
Carbohydrates are generally hydrophilic, meaning they are soluble in water.
Correct Answer: C — Hydrophilic nature
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Q. Which of the following is a characteristic of cellulose?
-
A.
Soluble in water
-
B.
Composed of glucose units
-
C.
Used for energy storage
-
D.
Contains α-1,4 glycosidic bonds
Solution
Cellulose is composed of glucose units linked by β-1,4 glycosidic bonds and is not soluble in water.
Correct Answer: B — Composed of glucose units
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Q. Which of the following is a characteristic of enzymes?
-
A.
They are consumed in reactions
-
B.
They increase the activation energy
-
C.
They are specific to substrates
-
D.
They function at all temperatures
Solution
Enzymes are highly specific to their substrates, allowing them to catalyze specific biochemical reactions.
Correct Answer: C — They are specific to substrates
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Q. Which of the following is a characteristic of fibrous proteins?
-
A.
Soluble in water
-
B.
Structural role
-
C.
Globular shape
-
D.
Enzymatic activity
Solution
Fibrous proteins are typically insoluble in water and serve structural roles in cells and tissues.
Correct Answer: B — Structural role
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