intro
MCQs 1:
Which of the following is the reason that water shields organisms from abrupt thermal changes?
Topic: Thermal Properties of Water
Correct Answer: C) Possesses high heat capacity
- The question is asking about a property of water that protects organisms from sudden temperature changes.
- While all these options are properties of water, the one that directly contributes to thermal protection is its high heat capacity.
- High heat capacity means that water can absorb or release a large amount of heat with little change in its own temperature, thus shielding organisms in water from drastic temperature changes.
- Therefore, the correct answer is C, "Possesses high heat capacity".
MCQs 2:
In the process of condensation, when monomers merge to form larger complex molecules, what happens?
Topic: Polymerization and Condensation Reactions
Correct Answer: A) Water is released
- The process of condensation involves the fusion of monomers to create larger, more complex molecules.
- As an outcome of this process, water is often released, signifying that option A is the correct answer.
- Understanding this basic principle of polymerization and condensation reactions can help in answering such questions.
MCQs 3:
Among the options listed, which is the most abundant organic molecule found in nature?
Topic: Abundance of Organic Molecules in Nature
Correct Answer: D) Carbohydrates
- When it comes to organic molecules, carbohydrates, particularly cellulose, are the most abundant in nature.
- While water is the most abundant molecule overall, it is not organic.
- Consequently, the correct answer is D, "Carbohydrates".
MCQs 4:
What is the most abundant organic biomolecule present in a cell?
Topic: Abundance of Organic Biomolecules in Cells
Correct Answer: B) Protein
- The most abundant biomolecule in a cell is water, but among organic biomolecules, proteins are the most plentiful.
- This distinction is crucial to correctly answer this question.
- Thus, the correct response is B, "Protein".
MCQs 5:
What can the human body utilize?
Topic: Chirality in Biochemistry
Correct Answer: D) Both A and B
- This question is about the chirality of biomolecules and their use in the human body.
- Right-handed sugars (D-sugars) and left-handed amino acids (L-amino acids) are biochemically active and usable by the human body.
- Therefore, the correct answer is D, "Both A and B".
MCQs 6:
What type of glycosidic bond is contained in a sucrose molecule?
Topic: Biochemical Bonds in Sugars
Correct Answer: C) 1,2-glycosidic
- This question is about the type of glycosidic bond found in sucrose, a disaccharide.
- Sucrose is formed from glucose and fructose, where the 1st carbon of glucose and the 2nd carbon of fructose join to form a 1,2-glycosidic bond.
- Thus, the correct answer is C, "1,2-glycosidic".
MCQs 7:
Which of the following increases with the removal of hydrogen bonds between water molecules?
Topic: Hydrogen Bonds and Physical Properties of Water
Correct Answer: D) Both decrease
- Hydrogen bonds between water molecules have a significant impact on water's physical properties, such as its boiling and freezing points.
- The absence of hydrogen bonds would lower both boiling and freezing points of water, making it boil at -80°C and freeze at -100°C.
- Therefore, the correct answer is D, "Both decrease".
MCQs 8:
What type of disaccharide results from the combination of monosaccharides with distinct functional groups through a condensation reaction?
Topic: Formation of Disaccharides
Correct Answer: C) Sucrose
- This question pertains to the creation of disaccharides from monosaccharides.
- Lactose is formed by the combination of glucose and galactose, which both have the aldehyde functional group.
- Maltose is created from two glucose molecules, whereas sucrose is formed when an aldehyde group from glucose combines with a ketone group from fructose.
- Therefore, the correct answer is C, "Sucrose".
MCQs 9:
How many amino acids constitute a pentapeptide chain?
Topic: Peptide Chains
Correct Answer: A) Five
- This question is about the structure of peptide chains.
- The term "penta-" indicates "five", which implies a pentapeptide chain consists of five amino acids.
- Thus, the correct answer is A, "Five".
MCQs 10:
A carbohydrate in which both sides of the carbonyl carbon have –R groups is known as what?
Topic: Carbohydrate Classification
Correct Answer: B) Ketone
- This question relates to the identification of carbohydrates based on their functional groups.
- If a carbonyl carbon is flanked by –R groups on both sides, the carbohydrate is classified as a ketone.
- Therefore, the correct answer is B, "Ketone".
MCQs 11:
What type of bond is responsible for the cohesive force between water molecules?
Topic: Hydrogen Bonding in Water
Correct Answer: B) Hydrogen
- The question explores the type of bond responsible for the cohesive force between water molecules.
- Water molecules are held together by a specific type of bonding known as hydrogen bonding.
- Consequently, the correct response is B, "Hydrogen".
MCQs 12:
Which unbranched polysaccharide forms the cell walls of plants?
Topic: Polysaccharides in Plant Cell Walls
Correct Answer: A) Cellulose
- This question probes the type of unbranched polysaccharide that makes up the cell walls of plants.
- The plant cell walls are primarily composed of cellulose, a type of unbranched polysaccharide.
- Hence, the appropriate answer is A, "Cellulose".
MCQs 13:
What aspect differentiates amino acids within the same class?
Topic: Amino Acid Classification
Correct Answer: A) –R group
- The question deals with the factor that distinguishes amino acids within the same class.
- While all amino acids have an alpha carbon, COOH, and an amino group, it's the –R group that varies and thus differentiates them.
- As a result, the correct answer is A, "–R group".
MCQs 14:
Which type of polysaccharide is stored in the human body for future use?
Topic: Polysaccharide Storage in Humans
Correct Answer: D) Glycogen
- This question pertains to the type of polysaccharide that is stored in the human body for future use.
- While cellulose forms plant cell walls and chitin is found in the exoskeletons of arthropods, starch is stored in plants.
- Glycogen, on the other hand, is stored in the human body, particularly in the liver.
- Thus, the correct response is D, "Glycogen".
Question 15:
What type of functional group does fructose possess?
Topic: Monosaccharide Functional Groups
Correct Answer: B) Ketone
- The question is about the type of functional group in fructose, a monosaccharide.
- Fructose is a hexose carbohydrate (containing six carbons) that has a ketone functional group at its carbonyl carbon.
- Consequently, the correct answer is B, "Ketone".
Question 16:
To which class does the amino acid tyrosine belong?
Topic: Classification of Amino Acids
Correct Answer: C) Aromatic
- This question pertains to the categorization of the amino acid tyrosine.
- The distinguishing feature of tyrosine is its aromatic side chain, which sets it apart from polar, nonpolar, and positively charged amino acids.
- Therefore, the correct response is C, "Aromatic".
Question 17:
Which polysaccharide found in the axial skeleton of arthropods contains an additional group?
Topic: Chitin in Arthropod Axial Skeletons
Correct Answer: C) Amino
- This question focuses on the additional group present in chitin, a polysaccharide found in the axial skeleton of arthropods.
- The distinguishing feature of chitin is its amino group, which sets it apart from other polysaccharides.
- Hence, the correct response is C, "Amino".
Question 18:
What is the most abundant biomolecule found in a cell?
Topic: Most Abundant Biomolecule in a Cell
Correct Answer: A) Water
- This question explores the biomolecule that is most abundant in a cell.
- Water is present in higher quantities than any other molecule, including proteins, nucleic acids, and carbohydrates.
- Therefore, the correct response is A, "Water".
Question 19:
Which property requires more heat?
Topic: Properties Requiring Heat
Correct Answer: B) Heat of vaporization
- The question deals with the property that necessitates more heat.
- While specific heat refers to a temperature change, heat of vaporization pertains to a change of state.
- As a result, heat is required in larger quantities for vaporization than for temperature changes, making B the correct answer, "Heat of vaporization".
Question 20:
Which of the following is the simplest carbohydrate containing an aldehyde functional group?
Topic: Simplest Carbohydrates
Correct Answer: A) Glyceraldehyde
- This question revolves around the simplest carbohydrate with an aldehyde functional group.
- Among the options, glyceraldehyde is a triose with three carbon atoms including one aldehyde group, making it the simplest carbohydrate bearing an aldehyde functional group.
- Therefore, the correct answer is A, "Glyceraldehyde".
Question 21:
What type of sugar is ribose?
Topic: Classification of Sugars
Correct Answer: C) Pentose
- This question focuses on the classification of ribose, a type of sugar.
- Ribose contains five carbon atoms, classifying it as a pentose sugar.
- Hence, the correct response is C, "Pentose".
Question 22:
Which statement is true regarding hydrolysis reactions?
Topic: Understanding Hydrolysis
Correct Answer: A) All breakdown reactions are hydrolysis.
- Not all breakdown reactions are hydrolysis, but all hydrolysis reactions involve the breakdown of molecules with the help of water.
- Hydrolysis specifically refers to the process of breaking down compounds using water.
- So, the correct answer is A, "All breakdown reactions are hydrolysis."
Question 23:
How many monosaccharide units are present in a pentose?
Topic: Structure of Pentose Sugars
Correct Answer: A) One
- The term 'pentose' refers to a sugar with five carbon atoms.
- However, 'pentose' is a monosaccharide, so it consists of a single unit of sugar.
- Therefore, the correct answer is A, "One."
Question 24:
Which disaccharide is commonly found in milk?
Topic: Types of Disaccharides
Correct Answer: A) Lactose
- Lactose is a disaccharide that is commonly found in milk.
- It is a specific type of complex sugar composed of two monosaccharide units.
- Hence, the correct answer is A, "Lactose."