Which process moves water molecules across the membrane of a cell?
A)diffusion
B)endocytosis
C)exocytosis
D)osmosis

2)
  In this organelle, carbon dioxide and water are converted to _________ and oxygen.
A)chitin
B)glucose
C)lipids
D)mannose

3)The cellular process in which materials are moved across a membrane from an area of low concentration to an area of high concentration is called
A)osmosis.
B)simple diffusion.
C)active transport.
D)passive transport.

4)Which numbered organelle produces ATP during cell respiration?
A)1
B)7
C)9
D)13
5)
  The movement of carbon dioxide out of cells and oxygen into cells can best be explained by which process?
A)osmosis
B)diffusion
C)exocytosis
D)active transport
6)
  What is the correct description of the relationship between osmosis and diffusion?
A)Diffusion is a type of osmosis that occurs across a cell membrane.
B)Osmosis is a type of diffusion that occurs across a cell membrane.
C)Osmosis is a type of diffusion that requires energy on the part of the cell, whereas diffusion happens freely.
D)Osmosis is not directly related to diffusion. Osmosis involves the movement of liquids. Diffusion involves movement of gases.
7)
  Substances like oxygen pass through the cell without the use of energy and move from an area of high concentration to an area of low concentration. This process is called
A)osmosis.
B)filtration.
C)active transport.
D)passive transport.
8)
  Transport of materials into a cell against a concentration gradient, from low to high, requires
A)water.
B)energy.
C)osmosis.
D)a passageway.
9)



  The cell membrane forms a protective barrier between the external and internal environments. It is referred to as ___________________, because it allows some substances to cross more easily than others and blocks other substances from crossing into the cell.
A)impermeable
B)a fluid mosaic
C)a plasma membrane
D)selectively permeable
10)
  About two-thirds of a cell is composed of water. What is the name of the process in which water moves into or out of the cell membrane to maintain homeostasis?
A)regulation
B)endocytosis
C)exocytosis
D)osmosis
11)
  Which statement describes what occurs in both animal and plant cells?
A)Nitrogen is used for respiration and oxygen is a waste product.
B)Oxygen is used for respiration and carbon dioxide is a waste product.
C)Nitrogen is used for respiration and carbon dioxide is a waste product.
D)Carbon dioxide is needed for respiration and oxygen is a waste product.
12)



  Describe the movement of molecules in the illustration.
A)Molecules are moving from a lower concentration to a higher concentration.
B)Molecules are moving from a higher concentration to a lower concentration.
C)Molecules are moving from a higher concentration to a lower concentration and then from a lower to higher concentration.
D)Molecules are moving from a lower concentration to a higher concentration and then from a higher concentration to a lower concentration.
13)



  The movement of oxygen molecules over time from one side of the semipermeable membrane to the other side is known as
A)osmosis.
B)diffusion.
C)plasmolysis.
D)active transport.
14)



  Why don't animal cells need chloroplasts?
A)Animals do not make their own food.
B)Animal cells make their own chlorophyll.
C)Animal cells collect sunlight another way.
D)Animals use photosynthesis to make their own food.
15)



  Plants have chloroplasts in their cells that give them a green color. What is in a chloroplast that provides the green color?
A)chlorophyll
B)DNA
C)proteins
D)