Classifying and Exploring Life

Why do medical doctors consider blood a tissue?

• It is a liquid found in the bodies of organisms.

• It is different types of cells working together.

• It is found in all parts of the human body.

• It is necessary for all life functions.

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Which sequence correctly shows the levels of organization from structure to function in a human?

• cell → tissue → organ → organ system

• organ system → cell → tissue → organ

• tissue → organ → organ system → cell

• cell → organ → tissue → organ system

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Why are cells called the basic units of life?

• Cells have their own organs.

• All cells can produce their own food.

• Cells do the work that keeps all organisms alive.

• Cells form tissues and organs in every living organism.

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Which of the following is NOT a premise of modern cell theory?

• I only

• II only

• I and II

• II and III

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Which of the following explains one main reason why some cells in multicellular organisms repeatedly divide?

• removal of wastes

• growth of the organism

• take in and use oxygen

• production of more food

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Cells must be able to perform certain functions in order to survive. Which of the following must ALL cells do to survive?

• obtain energy

• absorb wastes

• move to avoid predators

• use oxygen and give off carbon dioxide

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The kingdom Fungi is characterized by having organisms that reproduce with spores, absorb energy from hosts or dead matter, and have cells with cell walls that are made of chitin. Using the picture, which organism belongs to the kingdom Fungi?

• snake, only

• mushroom, only

• snake and mushroom

• orange and mushroom

The diagram below shows a cross section of a flower with the pistil and stamen labeled. The pistil and stamens are involved in seed formation. Using this information and the picture, what can be determined about the pistil and stamens?

• They are all individual plant tissues.

• They are part of an organ system of the plant.

• They are cells, the level of organization directly below organs.

• They are organs, the lowest level of organization in a living organism.

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Which of the following is an example of an organ system?

• the outermost layer of cells on the leaf of a plant

• a heart, arteries, and veins all working together

• the living material that lines the inside of a cheek

• a human bladder, which stores waste for removal

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Which description of bacteria or viruses is true?

• Viruses are beneficial to all living things.

• Bacteria need a host cell to reproduce.

• Bacteria are harmful to all living things.

• Viruses can cause many different illnesses.