Why is a spaghetti strainer (like the one shown) a suitable model for a selectively-permeable membrane?

• The strainer shows the passing of all materials requiring no energy.

• The strainer allows only one substance to pass through while preventing another substance from passing through.

• The strainer shows the movement of substances other than water without the need for a membrane.

• The strainer shows the movement of liquids from an area of high concentration to an area of low concentration.

To create an equilibrium during osmosis, what will be the net movement of the water molecules shown?

• Out of the cell, which will cause the cell to shrink

• Into the cell, which will cause the cell to shrink

• Out of the cell, which will cause the cell to swell

• Into the cell, which will cause the cell to swell

Which levels of organization of living things are listed correctly from most simple to most complex?

• Organism, tissue, cell, organ, organ system

• Organ system, organ, tissue, cell, organism

• Cell, tissue, organ, organ system, organism

• Cell, organ, tissue, organism, organ system

The liver is a collection of tissues that work together to help remove toxins from the blood. The liver is a(n) –

• Organism

• Organ system

• Organ

• Cell

An amoeba behaves like an animal, but it only has one cell. It eats plants, other protozoa, and even bacteria. It produces waste and reproduces. An amoeba is a(n)-

• unicellular organism

• unilateral organism

• multicellular organism

• multilateral organism

How are unicellular organisms and multicellular organisms similar?

• Both need energy and exchange gases.

• Both have organ systems that carry out life processes.

• Both require many cells to perform all necessary life functions.

• Both allow for a division of labor when carrying out life processes.

Which of the following organisms performs all life process in one cell?

• Tree

• Moss

• Bacteria

• Bird

The cell shown is long and thin, so it can send messages over long distances throughout the body. What kind of cell is it?

• Nerve cell

• Muscle cell

• Sperm cell

• Skin cell

Which of the following is NOT a life process performed by both unicellular and multicellular organisms?

• Reproduction

• Metabolism

• Tissue growth

• Gas exchange

Muscle cells and blood cells have different shapes. How does the shape of these specialized cells support the idea of “form fits function”?

• Muscle cells are long and fibrous for contraction, while blood cells are round and flexible for transport, showing that their shapes help them perform their specific functions.

• Both muscle cells and blood cells are round, which helps them move easily through the body.

• Muscle cells are flat and blood cells are square, which helps them fit together tightly.

• The shapes of muscle cells and blood cells do not affect their functions.