WorksheetsCell Transport
Total questions: 21
Worksheet time: 21mins
The cell membrane of the red blood cell will allow water, oxygen, carbon dioxide, and glucose to pass through. Because other substances are blocked from entering, this membrane is called
Perforated
Semi-permeable
Non-conductive
Permeable
The kidneys regulate the levels of many chemicals and ions in the body. Which term BEST describes this process?
digestion
circulation
homeostasis
meiosis
Which is an example of osmosis?
potassium ions moving in and out of an animal cell
carbon dioxide moving into the leaf of a plant cell
oxygen moving into the bloodstream from the lungs
water moving into the root cells of a plant
In humans, glucose is kept in balance in the bloodstream by insulin. Which concept does this best illustrate?
adaptation
homeostasis
metabolism
organization
A particular toxin prevents cellular production of usable energy. Cells that are affected by this toxin are unable to carry out many of their normal functions. If cells were exposed to this toxin, which of these processes would probably be least affected?
mitosis
diffusion
respiration
photosynthesis
When red blood cells are placed in distilled water, the cells swell as water molecules enter them. By what process do water molecules move into the cells?
Facilitated Diffusion
Active Transport
Endocytosis
Osmosis
Many bacteria live in freshwater. Which of these statements best describes what will happen when freshwater bacterial cells are placed in salt water?
Water leaves the cell, causing the cell to expand
Water leaves the cell, causing the cell to shrink
Water enters the cell, causing the cell to expand
Water enters the cell, causing the cell to shrink
A student designed an experiment to see if plants grow better when watered with a sugar solution. He divided the plants into six groups, measured the initial height of each plant, and calculated the average height for each group. Once a week, for two months, he watered the plants in each group using different sugar solutions for each plant group. At the end of the two months he measured the final height and calculated the average. The student's data is shown in the table. Which of these statements explains why the plants in Groups E and F died?
The high sugar content caused too much water to move out of the root cells
The high sugar content caused too much water to move into the root cells
The high sugar content prevented the plant from capturing energy
The high sugar content clogged the pores in the cell membranes
The diagram shows an animal cell in a beaker containing a solution of sugar and water. The cell membrane is permeable only to water. Which statement describes the relationship between the animal cell and the contents of the beaker?
There is a higher concentration of water inside the cell than outside the cell.
There is a higher concentration of sugar inside the cell than outside the cell
There is an equal concentration of water inside the cell as outside the cell
There is an equal concentration of sugar inside the cell as outside the cell
In which of the following ways does the plasma membrane regulate the entry of molecules into a cell?
The membrane allows only certain molecules to move into the cell
The membrane destroys most molecules so that they do not enter the cell
The membrane changes only certain molecules into ions before they move into the cell
The membrane allows most molecules to transfer energy to the cell without entering the cell
The binding of sodium ions (NA+) to a membrane protein is one of the first steps in initiation of the sodium-potassium pump that moves these ions across the membrane. The picture shows the initial step of this process. How does the protein get the energy needed to continue the process of moving NA+ across the cell membrane?
Mitochondria will attach to the protein and provide the energy to push the NA+ through the proteins.
Energy from ADP is released and a channel in the membrane protein permanently opens, resulting in the passage of the NA+
Energy produced from the difference in solute concentration on both sides of the membrane pulls the NA+ through the protein
ATP attaches to the protein and releases a phosphate, making energy available to change the shape of the protein and allowing the passage of the NA+
How is energy made available to the cell to move large starch molecules across the membrane through the process of endocytosis?
Removing a phosphate from ATP
Combining two glucose molecules
Breaking carbon bonds in fatty acids
Splitting the oxygen and hydrogen in a water molecule
A person with swollen gums rinses his mouth with warm salt water, and the swelling decreases. Which as occurred?
The swollen gums have absorbed the saltwater solution
The saltwater solution lowers the temperature of the water in the gums
The salt in the solution has moved against the concentration gradient
The water in the gums has moved from a high to a low concentration of water.
During strenuous exercise, body temperature increases. The body responds to the increase in temperature by sweating, which helps to reduce the body temperature. Which is demonstrated in this situation?
Excretion
Metabolism
Homeostasis
Synthesis
A freshwater plant is placed in a container of saltwater. What will most likely happen to the cells of the plant?
They will swell because water will move into them
They will swell because salt will move into them
They will shrink because water will move out of them
The will shrink because salt will move out of them
If energy is needed to move materials into or out of a cell, what is most likely occurring?
Active transport
Passive transport
Osmosis
Diffusion
Which would be the best evidence that a cell is using active transport to move a substance across its cell membrane?
Substances are moving rapidly across the cell membrane
ATP is being rapidly consumed near the cellular membrane
Substances are moving from high to low concentration
Substances are moving through channels in the cell membrane
The cellular process known as the sodium-potassium pump was discovered in the 1950's by Jens Christian Skou, a Danish scientist. This process is a form of active transport that moves three sodium ions to the outside of the cell for every two potassium ions that it moves into the cell. Which of these best explains why energy is needed for active transport?
Ions are negatively charged
Ions are attached to large proteins
Ions are trapped inside the plasma membrane
Ions are moved against the concentration gradient
Some students used vinegar to dissolve away the shells of three eggs and used these eggs as models of human red blood cells. The students observed the changes in the eggs when they were placed in different solutions. Which statement best describes the role of the cell membrane in this model?
The cell membrane is a impermeable barrier that prevents water from entering the cell
The cell membrane allows solutes to enter the cell which causes the cell to shrink
The cell membrane allows water to enter and leave the cell
The cell membrane removes solutes from the environment
This diagram shows cellular activity across a cell membrane. Which two processes does this diagram most directly model?
Energy conversion and synthesis of new molecules
Synthesis of new molecules and homeostasis
Transport of molecules and energy conversions
Homeostasis and transport of molecules
The picture shows a contractile vacuole of a unicellular freshwater organism. The contractile vacuole regulates the flow of water into and out of the cell in an aquatic environment. What conditions cause the contractile vacuole to fill with water?
The concentration of water is greater outside the cell than inside the cell
The temperature of water in the vacuole is higher than the temperature of its environment
The concentration of water inside the cell is the same as the concentration of water outside the cell
The temperature of water in the vacuole is lower than the temperature of its environment
