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Introduction to Cells: Cell Theory and Evidence

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Introduction to Cells: Cell Theory and Evidence

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Questions and Answers

Which of the following statements accurately represents a part of the cell theory?

The cell is not the fundamental unit of life according to the cell theory.

Viruses are considered living organisms according to the cell theory.

All living things are composed of atoms according to the cell theory. (correct)

Cells come from non-living sources according to the cell theory.

What supports the claim that cells are the basic unit of life according to the cell theory?

Cells can survive without oxygen.

Cells come in various shapes and sizes.

Cells contain DNA.

Cells are the smallest living structures. (correct)

In scientific language, how is a 'theory' different from its everyday use?

'Theory' in daily use is always based on scientific evidence.

'Theory' in science is based on unproven guesses.

'Theory' in daily language is held to a higher standard than in science.

'Theory' in science is backed by repeated observations and experiments. (correct)

Why have we never observed the cell theory not to be true?

Because all cells come from preexisting cells. Signup and view all the answers

Which statement contradicts the cell theory?

Cells are capable of spontaneous generation. Signup and view all the answers

What is the main reason why cells are often limited in size by the surface area to volume (SA:V) ratio?

To ensure efficient exchange of nutrients and waste Signup and view all the answers

Which characteristic defines all living things' capability to produce similar cells/organisms from existing ones?

Reproduction Signup and view all the answers

In larger cells, why does the efficiency of exchange decrease compared to smaller cells?

Larger cells have relatively less surface area compared to volume Signup and view all the answers

Which cell adaptation maximizes the surface area to volume ratio by having long extensions?

Neurons Signup and view all the answers

Why are cubes often used to model cell size despite cells not being cubic in shape?

Because cubes are easier to visualize and measure Signup and view all the answers