Which objective lens requires oil to be applied?
Multiple choice.
4x
10x
40x
100x
The Correct Answer is D
Choice A rationale: 4x is incorrect because 4x is the lowest magnification objective lens that does not require oil to be applied. 4x is also called the scanning objective lens because it is used to scan the whole slide and find the specimen. 4x has a large field of view and a low resolution.
Choice B rationale: 10x is incorrect because 10x is the medium magnification objective lens that does not require oil to be applied. 10x is also called the low power objective lens because it is used to observe the specimen in more detail. 10x has a smaller field of view and a higher resolution than 4x.
Choice C rationale: 40x is incorrect because 40x is the high magnification objective lens that does not require oil to be applied. 40x is also called the high power objective lens because it is used to observe the specimen in greater detail. 40x has a smaller field of view and a higher resolution than 10x.
Choice D rationale: 100x is correct because 100x is the highest magnification objective lens that requires oil to be applied. 100x is also called the oil immersion objective lens because it is used to observe the specimen in the highest detail. 100x has a very small field of view and a very high resolution. Oil is applied between the slide and the lens to reduce the refraction of light and increase the clarity of the image.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is E
Explanation
Choice A rationale: The presence of chloroplasts is incorrect because chloroplasts are organelles that perform photosynthesis, not osmosis. Chloroplasts do not affect the water balance of the cell.
Choice B rationale: A plant cell will not burst in a hypotonic solution because water is moving out of the cell is incorrect because water moves into the cell in a hypotonic solution, not out of it. A hypotonic solution has a lower solute concentration than the cell, so water flows from the solution to the cell by osmosis.
Choice C rationale: Chloroplasts that help pump the excess water out of the cell is incorrect because chloroplasts do not have any role in pumping water out of the cell. The cell uses active transport to pump out excess water, which requires energy from ATP, not chloroplasts.
Choice D rationale: The plasma membrane is incorrect because the plasma membrane is permeable to water, so it cannot prevent water from entering the cell. The plasma membrane only regulates the passage of solutes, not water.
Choice E rationale: The cell wall is correct because the cell wall is a rigid structure that surrounds the plasma membrane and provides mechanical support to the cell. The cell wall can withstand the pressure of water entering the cell and prevent the cell from bursting. The cell wall is made of cellulose, a polysaccharide that is resistant to water.
Correct Answer is D
Explanation
Choice A rationale: Proteins contain nitrogen, but this is not the reason why they cannot pass through plasma membranes. Nitrogen is a common element in many organic molecules, including nucleic acids and amino acids, which can cross the membrane under certain conditions.
Choice B rationale: Proteins do not cause emulsification, which is the process of breaking down large fat droplets into smaller ones. Emulsification is facilitated by bile salts, which are amphipathic molecules that have both hydrophilic and hydrophobic regions. Proteins are not amphipathic, and they do not interact with fats in this way.
Choice C rationale: The membrane is made of protein, but this does not prevent proteins from passing through it. The membrane is composed of a phospholipid bilayer with embedded proteins, which can act as channels, carriers, receptors, or enzymes for various substances. Some proteins can cross the membrane by using these transport proteins, or by endocytosis or exocytosis.
Choice D rationale: Proteins are very large molecules, and this is the main reason why they cannot pass through plasma membranes. The size of a molecule determines its permeability across the membrane, and proteins are too big to diffuse through the small gaps between the phospholipids or the pores of the transport proteins. Proteins can only cross the membrane by vesicular transport, which requires energy and specific signals.
Choice E rationale: Proteins do not bind to the phospholipids, which are the main components of the membrane. Phospholipids are also amphipathic molecules, with a hydrophilic head and a hydrophobic tail. Proteins are generally hydrophilic, and they do not associate with the hydrophobic core of the membrane. Proteins can bind to other proteins or carbohydrates on the surface of the membrane, but this does not affect their ability to cross it.
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
Report Wrong Answer on the Current Question
Do you disagree with the answer? If yes, what is your expected answer? Explain.
Kindly be descriptive with the issue you are facing.