Nokea
Which type of carbohydrate is the main component of the cell wall in plant cells?
- A. Starch
- B. Glucose
- C. Cellulose
- D. Chitin
Correct Answer: C
Rationale: The correct answer is 'Cellulose.' Cellulose is the main component of the cell wall in plant cells, providing structural support and rigidity. Starch, while a carbohydrate, is a storage form of glucose in plants and not a component of the cell wall. Glucose is a simple sugar that can be used as an energy source but is not the main component of the cell wall. Chitin is a structural carbohydrate found in the exoskeleton of arthropods and fungi, not in plant cell walls.
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Which of the following is NOT a type of asexual reproduction in bacteria?
- A. Binary fission
- B. Conjugation
- C. Budding
- D. Transduction
Correct Answer: D
Rationale: A) Binary fission: This is a common method of asexual reproduction in bacteria where a single cell divides into two identical daughter cells.
B) Conjugation: This is a process in which genetic material is transferred between bacterial cells through direct cell-to-cell contact, leading to genetic recombination.
C) Budding: Budding is a form of asexual reproduction where a new organism develops from an outgrowth or bud on the parent organism.
D) Transduction: Transduction is a method of horizontal gene transfer in bacteria where genetic material is transferred from one bacterium to another by a bacteriophage (a virus that infects bacteria). It is not a form of asexual reproduction in bacteria.
Therefore, the correct answer is D) Transduction, as it is not a type of asexual reproduction in bacteria but a mechanism of genetic exchange.
Which force opposes the relative motion between surfaces in contact?
- A. Tension force
- B. Frictional force
- C. Gravitational force
- D. Magnetic force
Correct Answer: B
Rationale: The correct answer is B: Frictional force. Frictional force opposes the relative motion between surfaces in contact. When two surfaces are in contact and one tries to slide over the other, the frictional force resists this motion, making it harder for the surfaces to move relative to each other. Choice A, tension force, is incorrect because tension force is a force transmitted through a string, rope, cable, or wire when it is pulled tight by forces acting from opposite ends. Choice C, gravitational force, is incorrect as it is the force of attraction between two masses. Choice D, magnetic force, is incorrect as it is the force exerted between magnetic objects.
Which of the following types of muscle tissue is found attached to bones and allows for voluntary movement?
- A. Smooth muscle
- B. Cardiac muscle
- C. Skeletal muscle
- D. Connective tissue
Correct Answer: C
Rationale: The correct answer is C: Skeletal muscle. Skeletal muscle is attached to bones and allows for voluntary movement, such as walking, running, and lifting objects. Smooth muscle, found in the walls of internal organs and blood vessels, is responsible for involuntary movements. Cardiac muscle is specific to the heart and controls involuntary contraction. Connective tissue, on the other hand, provides support and connects different structures in the body, but it is not responsible for voluntary movement like skeletal muscle.
What is the general formula for an alkyl halide?
- A. Câ‚™Hâ‚‚â‚™
- B. CₙH₂ₙ₊₂
- C. Câ‚™H₂ₙ₊â‚X
- D. Câ‚™Hâ‚‚â‚™O
Correct Answer: C
Rationale: The correct answer is option C, 'Câ‚™H₂ₙ₊â‚X.' This is the general formula for an alkyl halide, where X represents a halogen atom (such as fluorine, chlorine, bromine, or iodine), and the hydrocarbon chain is represented by Câ‚™H₂ₙ₊â‚. Option A, 'Câ‚™Hâ‚‚â‚™,' is incorrect because it does not account for the presence of a halogen atom. Option B, 'Câ‚™H₂ₙ₊₂,' is incorrect as it represents an alkene, not an alkyl halide. Option D, 'Câ‚™Hâ‚‚â‚™O,' is also incorrect as it suggests the presence of oxygen, which is not characteristic of alkyl halides.
Identify the organ responsible for blood filtration.
- A. Liver
- B. Kidneys
- C. Spleen
- D. Pancreas
Correct Answer: B
Rationale: The correct answer is B: Kidneys. The kidneys are the organs responsible for blood filtration in the human body. They filter waste products and excess substances from the blood to produce urine. The liver is primarily involved in detoxification and metabolism, the spleen functions in immune responses and blood storage, and the pancreas aids in digestion and blood sugar regulation. Therefore, choices A, C, and D are incorrect as they do not primarily serve the function of blood filtration.