Cell Review

Shayna placed a prepared slide of tissue from Zea mays, a corn leaf, under a microscope. She placed the slide on the stage and switched from low to high power. She used the adjustment knobs to focus the image. When she looked into the eyepiece, she observed many room-like structures. She made a sketch in her journal of her observations.

Which part of the cell theory does Shayna's sketch provide evidence for?

• All cells are invisible.

• All cells come from plant cells.

• All organisms come from seeds.

• All organisms are made of cells.

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NGSS.MS-LS1-1

This model shows a type of cell.

What is located at T?

• the cell membrane, which is found in animal and plant cells

• the cell membrane, which is found only in animal cells

• the cell wall, which is found in animal and plant cells

• the cell wall, which is found in only plant cells

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NGSS.MS-LS1-1

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Which list correctly shows the three parts of cell theory?

• The cell is the most basic unit of life.

  Cells come from pre-existing cells.

  All organisms are composed of cells.

• The organelle is the most basic unit of life.

  Cells can instantly generate.

  Some cells are larger than other cells.

• Unicellular organisms are composed of cells.

  Cells can make their own energy.

  Organelles are inside of cells.

• Tissues are made of organelles.

  All cells divide asexually.

  All organisms are composed of cells.

According to cell theory, what is the similarity of all unicellular and multicellular organisms?

• Both are autotrophic.

• Both are composed of cells.

• Both have tissues and organs.

• Both have cells with cell walls.

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NGSS.MS-LS1-1

The end result of mitosis is ​ (one or two?) (a)   daughter cells that are genetically (identical or unique?)​ (b)  

• two

• identical

• Unique

• one

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b.5a

What is the basic unit of life?

• Atom

• Cell

• Molecule

• Organ

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Which statement is part of the cell theory?

• All cells have a nucleus

• Cells are the basic unit of life

• Cells can only be seen with a microscope

• All cells are identical

Answer explanation

The correct statement is 'Cells are the basic unit of life,' which is a fundamental principle of cell theory. The other options are incorrect as not all cells have a nucleus, can be seen with the naked eye, and are not identical.

A model of DNA is shown on the right. What is the arrow pointing to in this picture?

One answer.

• Deoxyribose

• Phosphate group

• nucleotides

• nitrogenous bases

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Which type of cells have not gone through differentiation yet?

• nerve cells

• skin cells

• stem cells

• muscle cells

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NGSS.HS-LS1-4

In science class, Cindy and Jane are conducting an investigation on living things to find out what the difference is between unicellular and multicellular organisms. First, they use a microscope to observe different types of organisms. Next, they go to the library to do more research on the organisms they observed with the microscope. Afterward, Cindy and Jane reviewed the observations and data results they recorded to come to a conclusion to the question: What is the difference between a unicellular organism and a multicellular organism?

• Unicellular organisms do not respond to stimuli in the environment. Multicellular organisms do respond to stimuli in the environment.

• Unicellular organisms are producers and multicellular organisms are consumers.

• Unicellular organisms perform all functions for life with one cell. Multicellular organisms have many cells that work together to keep them alive.

• Unicellular organisms are heterotrophs and multicellular organisms are autotrophs.

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NGSS.MS-LS1-1