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Cell Discovery and Structure

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Questions and Answers

Who discovered the nucleus in the cell?

Leeuwenhoek

Robert Hooke

Robert Brown (correct)

Purkinje

What was the significant improvement that led to the discovery of free-living cells in pond water?

Improvement in the magnifying lens

Discovery of the cell theory

Improvement in the microscope (correct)

Invention of the electron microscope

What is the term coined by Purkinje in 1839?

Protoplasm (correct)

Nucleus

Cell theory

Cell wall

Who presented the cell theory that all living organisms are composed of cells?

Schleiden and Schwann Signup and view all the answers

What is the term used to describe organisms that consist of a single cell?

Unicellular organisms Signup and view all the answers

How do multi-cellular organisms arise from a single cell?

Through cell division Signup and view all the answers

What is the purpose of using iodine solution or other staining solutions on cells?

To observe the cell structure more clearly Signup and view all the answers

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

To allow material transfer between the nucleus and cytoplasm Signup and view all the answers

What is the shape of the cells observed from the cheek?

Oval or spherical Signup and view all the answers

What is the purpose of using a cover-slip in microscopy?

To flatten the sample and prevent it from moving Signup and view all the answers

What is the name of the structure found near the centre of each cell?

Nucleus Signup and view all the answers

What tool is used to transfer the material from the cheek to the glass slide?

Needle Signup and view all the answers

What is the origin of the substance Robert Hooke observed under his self-designed microscope?

Bark of a tree Signup and view all the answers

What is the Latin word for 'a little room' that is used to describe the units observed by Robert Hooke?

Cell Signup and view all the answers

What is the purpose of placing the onion peel in a watch-glass containing water?

To prevent the peel from getting folded or dry Signup and view all the answers

What instrument did Robert Hooke use to observe the structure of the cork?

Self-designed microscope Signup and view all the answers

In what year did Robert Hooke make the observation that living things appear to consist of separate units?

1665 Signup and view all the answers

What is the purpose of putting a drop of water on the glass slide?

To transfer the peel to the slide Signup and view all the answers