AP BIOLOGY

THE CELL

CELL THEORY

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

Before an investigation on the human body, students were asked to predict how new cells were created. According to cell theory, which student’s prediction is correct?

A	Humans are born with all the cells they will ever have. The cells grow and develop, but are not replaced.
B	New cells are created from nutrients in the food we eat, such as calcium from milk.
C	New cells are created from existing cells as cells begin to wear out
D	New cells are created by the reproductive system to reproduce cells that are worn out

Explanation:

Detailed explanation-1: -Cell Theory Scientists once thought that life spontaneously arose from nonliving things. Thanks to experimentation and the invention of the microscope, it is now known that life comes from preexisting life and that cells come from preexisting cells.

Detailed explanation-2: -The original cell theory states that the cell is the basic structural and functional unit of living organisms and all cells come from other cells. The scientists Matthias Schleiden and Theodor Schwann are credited with establishing the cell theory in 1839.

Detailed explanation-3: -The classical cell theory was proposed by Theodor Schwann in 1839. There are three parts to this theory. The first part states that all organisms are made of cells. The second part states that cells are the basic units of life.

Detailed explanation-4: -The cell was first discovered by Robert Hooke in 1665 using a microscope. The first cell theory is credited to the work of Theodor Schwann and Matthias Jakob Schleiden in the 1830s.

There is 1 question to complete.