Q: A compound microscope uses two lenses to achieve higher magnification and resolution. If the objective lens magnifies 40x and the eyepiece magnifies 10x, what is the total magnification?

Total magnification $$= 40 \times 10 = 400$$

Question 1

Which scientist is credited with coining the term 'cell' after observing cork under a microscope, and what did he actually observe?

Accepted Answer

Robert Hooke; he observed the cell walls of dead plant tissue.

Question 2

What technological advancement allowed Antonie van Leeuwenhoek to observe living cells such as bacteria and sperm?

Accepted Answer

He produced small lenses that could magnify objects up to 300 times.

Question 3

Which of the following is NOT one of the original principles of the cell theory as postulated by Schwann in 1839?

Accepted Answer

All cells arise only from preexisting cells.

Question 4

Rudolf Virchow contributed to the cell theory by adding which principle?

Accepted Answer

All cells arise only from preexisting cells.

Question 5

Why did early scientists believe that plant and animal tissues were structurally different?

Accepted Answer

Plant cell walls are easily visible, while animal cells lack cell walls and are harder to distinguish.

Question 6

Which scientist's observations led to the identification of the nucleus in plant cells?

Accepted Answer

Robert Brown

Question 7

A compound microscope uses two lenses to achieve higher magnification and resolution. If the objective lens magnifies 40x and the eyepiece magnifies 10x, what is the total magnification?

Accepted Answer

Total magnification $$= 40 	imes 10 = 400$$

Question 8

Which of the following best explains why the cell theory is considered a unifying concept in biology?

Accepted Answer

It applies to all organisms, regardless of their diversity.

Question 9

A scientist observes a cell with spiral thickenings in its wall. Based on cell theory and structure-function relationships, what is the likely function of this cell?

Accepted Answer

Providing strength to water-conducting vessels in plants.

Question 10

If a microscope has a resolving power of 1 micrometer, what is the smallest structure it can clearly distinguish?

Accepted Answer

A structure that is 1 micrometer in size.

Question 11

Which Latin phrase encapsulates the principle that all cells arise from preexisting cells?

Accepted Answer

omnis cellula e cellula

Question 12

A student claims that all cells are identical in shape and function. Based on the study materials, which evidence best refutes this claim?

Accepted Answer

Cells exist in a wide variety of shapes and sizes, such as filamentous fungi, spiral bacteria, and branched neurons.

Question 13

Which scenario best illustrates the application of the third principle of cell theory in a medical context?

Accepted Answer

Cancer cells arise from the division of preexisting cells.

Question 14

If a scientist in the 1600s observed a cell filled with 'juices,' what was he most likely seeing?

Accepted Answer

The cytoplasm of a living cell.

Question 15

Which of the following statements about the diversity of cells is supported by the cell theory?

Accepted Answer

Despite their diversity, all cells share fundamental structural principles.

Question 16

A biologist is studying a tissue sample and cannot distinguish individual cells. Which historical observation explains this difficulty?

Accepted Answer

Animal cells lack cell walls, making boundaries less visible.

Question 17

Which of the following best describes the role of improved lens quality in the development of cell theory?

Accepted Answer

It allowed scientists to observe finer details and led to the discovery of nuclei and cell boundaries.

Question 18

If a microscope can magnify up to 300 times, and a cell is 2 micrometers in diameter, what will be the apparent diameter of the cell under the microscope?

Accepted Answer

Apparent diameter $$= 2 	imes 300 = 600$$ micrometers

Question 19

Which observation led Theodor Schwann to conclude that plant and animal tissues are fundamentally similar?

Accepted Answer

He observed well-defined boundaries in animal cartilage cells due to thick collagen deposits.

Question 20

A researcher is examining a single-celled organism from pond water. Which scientist's work is most relevant to this observation?

Accepted Answer

Antonie van Leeuwenhoek

The Origins and Principles of Cell Theory

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