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10 Questions

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Cell Discovery by Robert Hooke

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Questions and Answers

What is the purpose of using iodine solution, safranin solution, or methylene blue solution when observing cells?

To stain the cells for better visualization (correct)

To make the cells transparent

To clean the cells for observation

To change the shape of the cells

What differential feature was observed in different regions of the cells after staining with iodine solution?

Varied cell arrangements

Variation in cell shapes

Differences in cell coloration (correct)

Different sizes of cells

Why is it important to put a cover-slip on the material observed under a microscope?

To prevent contamination from other samples

To prevent evaporation of the solution (correct)

To protect the objective lens of the microscope

To flatten the material for better focus

What is the darkly colored spherical or oval structure near the center of each cell called?

Nucleus Signup and view all the answers

What is the double-layered covering of the nucleus called?

Nuclear envelope Signup and view all the answers

What is the main purpose of gently scraping the inside surface of the cheek for observation?

To observe cheek cells under a microscope Signup and view all the answers

After adding methylene blue solution to the material from the cheek cells, what should be done next?

Observe under a microscope Signup and view all the answers

What is the function of nuclear pores in the nuclear membrane?

Regulate movement of molecules between nucleus and cytoplasm Signup and view all the answers

Why do scientists prefer using safranin solution or methylene blue solution for staining cells?

To increase contrast and visibility of cell structures Signup and view all the answers

What would happen if one forgets to put a cover-slip on the observed material?

The material will dry out quickly Signup and view all the answers