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Questions and Answers
What did Robert Hooke discover in 1665?
What did Robert Hooke discover in 1665?
- The cytoplasm of a cell
- The mitochondria of a cell
- The cell itself (correct)
- The nucleus of a cell
Which type of cells lack a true nucleus?
Which type of cells lack a true nucleus?
- Animal cells
- Plant cells
- Eukaryotic cells
- Prokaryotic cells (correct)
What is the average size range of cells?
What is the average size range of cells?
- 0.5 to 20 (correct)
- 0.01 to 0.5
- 50 to 100
- 20 to 50
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Study Notes
- A cell is the fundamental unit of living beings and can carry out all necessary functions.
- Cells were discovered by Robert Hooke in 1665, who named them "cells".
- The cell theory was proposed in 1839, stating that all living organisms are composed of cells, which are the fundamental unit of life, and come from pre-existing cells.
- Cells vary in shape and size, ranging from microscopic to fairly large.
- The two types of cells are prokaryotic (primitive and unicellular) and eukaryotic.
- Prokaryotic cells lack a true nucleus and include bacteria and blue-green algae.
- Eukaryotic cells have a true nucleus and include plants, animals, and fungi.
- Unicellular organisms are capable of independent existence, such as amoeba.
- The average size of cells varies from 0.5 to 20.
- Some cells, like nerve cells, have irregular shapes.
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