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Questions and Answers
What was the primary advancement that allowed early scientists to observe cells for the first time?
What was the primary advancement that allowed early scientists to observe cells for the first time?
- The invention of the microscope (correct)
- The development of staining techniques
- The formulation of cell theory
- The discovery of DNA
Which principle of Cell Theory states that all cells originate from existing cells?
Which principle of Cell Theory states that all cells originate from existing cells?
- All living things are composed of one or more cells.
- All cells arise from preexisting cells through cell division. (correct)
- Cells contain genetic material passed to daughter cells.
- Cells are the basic units of structure and function.
In terms of the levels of organization, which of the following correctly defines an organelle?
In terms of the levels of organization, which of the following correctly defines an organelle?
- A subunit of a cell involved in a specific function. (correct)
- A collection of tissues working together.
- A group of cells performing a specific function.
- The simplest unit of life.
Which of the following levels of organization includes the heart as an example?
Which of the following levels of organization includes the heart as an example?
At what level of organization is hereditary information, or DNA, primarily contained?
At what level of organization is hereditary information, or DNA, primarily contained?
Flashcards
Cell Theory Principle 1
Cell Theory Principle 1
All living things are made of one or more cells.
Cell Theory Principle 2
Cell Theory Principle 2
Cells are the basic units of structure and function in organisms.
Cell Theory Principle 3
Cell Theory Principle 3
Cells arise from pre-existing cells.
Cell
Cell
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Cell Theory Principle 4
Cell Theory Principle 4
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Study Notes
Cell Theory
- Hooke and van Leuwenhoek's observations in the 17th century led to the initial understanding of "cells."
- Cell Theory principles consist of four core concepts:
- All living things are composed of one or more cells.
- Cells are the fundamental structural and functional units of organisms.
- New cells arise from pre-existing cells through cell division.
- Cells contain genetic material, passed to daughter cells during division.
Levels of Organization
- Life's complexity is organized into hierarchical levels:
- Atom: The simplest unit, e.g., oxygen.
- Molecule: Two or more atoms bonded together, e.g., carbon dioxide. Essential in biochemistry.
- Organelle: A specialized subunit within a cell, performing specific cellular functions.
- Cell: The basic unit of all life. Contains DNA and replicates through mitosis.
- Tissue: In multicellular organisms, a group of cells working together to perform a specific function.
- Organ: A collection of tissues performing a complex function. E.g., the heart pumps blood.
- System: A coordinated group of organs and tissues carrying out a major function. E.g., the digestive system.
- Organism: A complete living entity.
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