Cells Unit 3 Pretest (NUMS)

Which of these is the smallest?

• cells

• atoms

• molecules

• cell membranes

Nutritionists know that lipids are a vital nutrient that helps keep cells working properly. What is one way the cells in our bodies use lipids?

• to make amino acids

• to repair broken bones

• to form cell membranes

• to carry information in the cell

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Cells of a multicellular organism are specialized. What does this statement mean?

• Cells of a multicellular organism are adapted for performing a specific function.

• Each cell of a multicellular organism can survive independently of the other cells.

• Cells of a multicellular organism are specialized because they have a complex structure.

• Each cell of a multicellular organism can perform all the life functions the organism needs to survive.

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The illustration below shows an example of the levels of structural organization in living things.

Which of the following choices best completes the diagram?

• blood

• intestines

• a human body

• the circulatory system

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Which instrument below was first used to view cells and is now commonly used by students and scientists to make observations?

• 
• 
• 
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All living things are made of one ore more cells. What is true of all cells?

• They all have cytoplasm

• They all have DNA in their nucleus.

• They all have organelles bound by membrane.

• They all have DNA in their cytoplasm.

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In one type of cell division, a single cell forms two new cells. This process is called mitosis. What is a reason that human skin cells frequently undergo mitosis?

• to get energy for the body

• to create new muscle cells

• to prevent bruises on the body

• to replace dead or damaged skin cells

Which of the following is a type of active transport by which a cell surrounds a large particle and encloses the particle to bring it into the cell?

• exocytosis

• endocytosis

• homeostasis

• photosynthesis

In biology class, Zach observes cells. Each cell has a structure that separates the inside of the cell from the environment. Which structure is Zach observing?

• nucleus

• cytoskeleton

• cell membrane

• genetic material

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A student is examining a cell through a microscope. She notes the following cell parts: cell membrane, ribosomes, a central vacuole, a cell nucleus, and cytoplasm. The student states she is looking at a plant cell. How does she know this is correct?

• Only plant cells have cytoplasm.

• Only plant cells have central vacuoles.

• She is not correct; she’s actually looking at an animal cell.

• She can’t be sure because both plant and animal cells have those cell parts.