Biology Cells as a System

Identify two characteristics of all living things and describe why each is important to the survival of an organism.

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Which of these characteristics would disqualify a newly discovered biological structure from being called a cell?

• It cannot exchange materials with its environment.

• It does not contain membrane-bound organelles.

• It lacks a method for moving and gathering food.

• It has no stiff outer layer for support and protection.

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Theodor Schwann discovered that animal tissues are made of cells. Which part of the cell theory is based in part on Theodor Schwann’s findings?

• All organisms are made up of cells.

• New cells come from preexisting cells

• All organisms are composed of one or more cells.

• Cells produce proteins for the functioning of organisms.

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The smallest unit of a plant that can perform all of the processes of life is the

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A section of a kidney is shown in the diagram.

'What is the highest level of organization represented by the kidney?

• cell

• organ

• system

• tissue

Which level of organization is formed when similar cells specialized to perform a specific function come together?

• organ

• organism

• system

• tissue

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Which organism could be considered nonliving because it cannot carry out all the functions of life on its own as described in the cell theory?

• a virus

• a ]multicellular algae

• an unicellular algae

• a prokaryote

Which statement best explains why viruses are considered to be nonliving?

• They are only able to be viewed with a microscope.

• They are unable to reproduce independently.

• They lack genetic material.

• They have different types of proteins.

Why are both carbohydrates and lipids important in animal cells?

• They are components in cell walls.

• They provide insulation to the cell.

• They store energy for the cell.

• They make up the structure of DNA.

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This structure is the monomer for which category of molecules?

• carbs

• lipids

• nucleic acids

• proteins