Which objective lens provides the highest total magnification?
High power
Oil immersion
Low power
Scanning
The Correct Answer is B
Choice A rationale: High power is incorrect because high power is the second highest magnification objective lens, not the highest. High power is also called the 40x objective lens because it magnifies the specimen by 40 times. When combined with the 10x eyepiece lens, the total magnification is 400x.
Choice B rationale: Oil immersion is correct because oil immersion is the highest magnification objective lens. Oil immersion is also called the 100x objective lens because it magnifies the specimen by 100 times. When combined with the 10x eyepiece lens, the total magnification is 1000x. Oil immersion requires oil to be applied between the slide and the lens to reduce the refraction of light and increase the clarity of the image.
Choice C rationale: Low power is incorrect because low power is the second lowest magnification objective lens, not the highest. Low power is also called the 10x objective lens because it magnifies the specimen by 10 times. When combined with the 10x eyepiece lens, the total magnification is 100x.
Choice D rationale: Scanning is incorrect because scanning is the lowest magnification objective lens, not the highest. Scanning is also called the 4x objective lens because it magnifies the specimen by 4 times. When combined with the 10x eyepiece lens, the total magnification is 40x. Scanning is used to scan the whole slide and find the specimen.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A rationale: Up and down is incorrect because the mechanical stage upper knob does not control the vertical movement of the stage. The vertical movement of the stage is controlled by the coarse and fine adjustment knobs, which are located on the side of the microscope. The coarse adjustment knob is used to raise or lower the stage quickly, while the fine adjustment knob is used to fine-tune the focus of the specimen.
Choice B rationale: Right and left is correct because the mechanical stage upper knob controls the horizontal movement of the stage along the x-axis. The mechanical stage is a platform that holds the slide and the specimen, and it can be moved by two knobs that are located below the stage. The upper knob moves the stage right or left, while the lower knob moves the stage forward or backward.
Choice C rationale: Back and forth is incorrect because the mechanical stage upper knob does not control the horizontal movement of the stage along the y-axis. The horizontal movement of the stage along the y-axis is controlled by the mechanical stage lower knob, which is located below the stage and next to the upper knob. The lower knob moves the stage forward or backward, while the upper knob moves the stage right or left.
Choice D rationale: All of the answer choices are correct is incorrect because only one of the answer choices is correct. The mechanical stage upper knob only causes the stage to move right or left, not up and down or back and forth. The other movements of the stage are controlled by different knobs.
Correct Answer is A
Explanation
Choice A rationale: Carbon dioxide is not a product of the light reaction, but a reactant of the dark reaction. The light reaction does not use carbon dioxide, but water and light energy to produce ATP, NADPH, and oxygen¹.
Choice B rationale: NADPH is a product of the light reaction. It is an electron carrier that is reduced by the electrons from water in photosystem I. NADPH provides electrons and hydrogen for the dark reaction².
Choice C rationale: ATP is a product of the light reaction. It is an energy molecule that is synthesized by the enzyme ATP synthase using the proton gradient created by the electron transport chain. ATP provides energy for the dark reaction³.
Choice D rationale: Oxygen is a product of the light reaction. It is released as a by-product of the splitting of water in photosystem II. Oxygen is either used for cellular respiration or released into the atmosphere⁴.
Choice E rationale: Energy intermediates are not a specific product of the light reaction, but a general term for molecules that store energy or electrons, such as ATP and NADPH. Therefore, this choice is not incorrect, but less specific than choice A⁵.
Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.
Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today