TEKS B.4(B) - Cell Transport and Homeostasis

Which description best identifies this type of cellular transport?

• Active transport, because energy is being used to move molecules against the concentration gradient

• Facilitated diffusion, because energy is being used to move molecules with the concentration gradient

• Osmosis, because energy is being used to move molecules with the concentration gradient

• Endocytosis, because energy is not being used to move molecules against the concentration gradient.

In a study of physical endurance, researchers observed significant increases in the heart rates and breathing rates of participants immediately after they engaged in strenuous exercise.

Which statement best explains the increase in the heart rate and breathing rate during exercise?

• the water concentration in the blood increases.

• body cells require increased oxygen as energy is expended.

• muscle cells increase in temperature and require fluid to reduce the temperature.

• an increase in muscle activity causes increases in glucose levels in red blood cells.

Tags

NGSS.HS-LS1-7

NGSS.HS-LS2-3

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 condition caused 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 outside the cell.

• The temperature of water in the vacuole is lower than the temperature of its environment.

Tags

NGSS.HS-LS1-3

This diagram shows cellular activity across a cell membrane.

Which two process 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

Tags

NGSS.HS-LS1-7

NGSS.HS-LS2-3

Some students used vinegar to dissolve away the cells of these 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 an 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.

Tags

NGSS.MS-LS1-2