Which of the following factors would increase the rate of chemical reactions?
presence of enzymes
decreased concentration of reactants
lower activation energy
A&B
A&C
The Correct Answer is E
A. presence of enzymes: Enzymes are biological catalysts that speed up reactions by lowering activation energy.
B. decreased concentration of reactants: Lower concentration means fewer collisions between molecules, which slows reaction rate.
C. lower activation energy: Lowering the activation energy makes it easier for reactants to form products, increasing reaction rate.
D. A & B: While A is correct, B is not.
E. A & C: Both enzymes and reduced activation energy increase reaction speed.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Brain: The brain is the control center, not the effector.
B. Shivering: Shivering is a response, not an anatomical structure. The effector must be a structure that performs an action.
C. Thermoreceptors: These are the sensory receptors (detectors), not effectors.
D. Skeletal muscles: Skeletal muscles are the effectors that contract to produce shivering, generating heat in response to cold.
Correct Answer is D
Explanation
A. fluid: The cytosol is the fluid portion of the cytoplasm.
B. cytoplasmic inclusions: These include stored nutrients or pigments suspended in the cytosol (e.g., glycogen granules).
C. cytoskeletal elements: Elements like microfilaments and microtubules are found in cytosol and support cell shape and movement.
D. the nucleus: The nucleus is a separate organelle, surrounded by its own membrane, and is not part of the cytosol.
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