AP BIOLOGY

THE CELL

CELL THEORY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Tom learned about cell theory in science class. He recorded four ideas about cell theory in his science notebook. One of Tom’s ideas is incorrect. Which of Tom’s statements is INCORRECT, according to cell theory?
A
Cell theory tells what cells are, why they are important, and where they come from.
B
According to cell theory, humans, cats, flowers, and ants are all made of cells.
C
Cells are made of protein, lipids, nucleic acids, and water. if you mix these substances together in a beaker, cells will results.
D
Cells are the smallest possible living things. If it is smaller than a cell, it cannot be alive.
Explanation: 

Detailed explanation-1: -All known living things are made up of one or more cells. All living cells arise from pre-existing cells by division. The cell is the fundamental unit of structure and function in all living organisms. The activity of an organism depends on the total activity of independent cells.

Detailed explanation-2: -Cell theory was in contrast to the vitalism theories proposed before the discovery of cells. The observations of Hooke, Leeuwenhoek, Schleiden, Schwann, Virchow, and others led to the development of the cell theory. The cell theory is a widely accepted explanation of the relationship between cells and living things.

Detailed explanation-3: -The cell theory states that all biological organisms are composed of cells; cells are the unit of life and all life come from preexisting life. The cell theory is so established today that it forms one of the unifying principles of biology.

Detailed explanation-4: -The cell theory states that cells form the building blocks of life. It introduces the properties of cell. It was proposed by Matthias Schleiden and Theodor Schwann.

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