7th Grade Content

The table below summarizes the contribution of several scientists that led to the development of the cell theory. These events provide evidence that–

• Cells come from other living cells

• Human's scientific knowledge often depends upon improvements in technology

• Scientific discoveries are usually the work of only one scientist

• Scientific discoveries rarely build upon the work of others

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The cell theory contains basic ideas regarding the structure of living things. According to this theory, cells:

• Must be seen with a microscope

• Are made up of mostly empty space

• Are the structural unit of living things

• Are found only in animals

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Which of the following statements is NOT true?

• Cells can be studied without using a microscope

• All organisms are made up of one or more cells

• All living cells come from other living cells

• Cells are the basic unit of all living things

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 Five-year-old Justin thinks that snails come from pond rocks.  Whenever his dad adds pond rocks to their aquarium, snails soon appear in the water.  His older sister, Jenn, sets up the experiment below to clear up his confusion. Jenn explains to Justin that snails come from the jelly-like egg mass seen in Bowl 2 that often clings to pond rocks.  Her experiment proves which basic concept of the cell theory?

• All living things are made up of cells

• Cells are the basic unit of structure and function

• Cells come from other pre-existing cells

• Cells form chromosomes to prepare for mitosis

Which of the following is NOT part of the cell theory?

• All cells come from other cells

• Atoms are the smalled part of the universe

• Cells are the basic building blocks of all living things

• All living things are made of cells

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All of the following are in both animal and plant cells EXCEPT:

• Endoplascmic Reticulum

• Chloroplasts

• Mitochondria

• Nucleus

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Click on the four cell parts present in animal cells:

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Which two cell parts are found only in a plant cell?

• cell membrane and chloroplast

• cell wall and cytoplasm

• cell membrane and cytoplasm

• cell wall and chloroplasts

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Click on the cell image that most likely represents a plant cell:

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Which cell organelle is used to store food and waste?

• Vacuole

• Nucleus

• Chloroplast

• Cell membrane