All animal and plant cells are surrounded by a thin:

• Nucleus
• Vacuole 
• Cell Membrane 
• Cell Wall

 Waste products, like carbon dioxide, leave cells through the:

• ribosomes
• nucleus
• cell membrane
• mitochondria

Cells are the building blocks of:

• living things
• matter
• energy
• rocks

Both plant and animal cells contain:

• pseudopods
• cilia
• a nucleus
• chloroplasts

 Which of the following is in order from simplest to most complex?

• organ, tissue, cell, organ system
• organ system, organ, tissue, cell
•  cell, tissue, organ, organ system
• cell, organ, organ system, tissue

Which of the following is likely to be found in a cell from a maple leaf but not in a human nerve cell?

• cell wall
• mitochondria
• cell membrane
• cytoplasm

 In multicellular organisms, groups of tissues form:

• vacuoles
• organs
• cells
• organelles

A group of similar cells that all work together to perform a specific function is a:

• vacuole
• tissue
• prokaryote
• chloroplast

Which diagram best represents the levels of organization in the human body?

• a)
• b)
• c)
• d)

The respiratory system includes a layer of cells in the air passages that clean the air before it gets to the lungs. This layer of cells is best classifies as ...

• a tissue
• an organelle
• an organ
• an organ system