Biology Reading Check 8.3-8.4

Which are examples of active transport across the cell membrane?

• osmosis and diffusion

• diffusion and facilitated diffusion

• osmosis and chemiosmosis

• endocytosis and exocytosis

Wes places red blood cells in a petri dish with pure water and observes them under a microscope. He drew a model to illustrate his observations.

• The red blood cells were placed into an isotonic solution. Water moved into and out of the cells to maintain homeostasis.

• The red blood cells were placed into an isotonic solution. Water moved into the cells until the cells burst.

• The red blood cells were placed in a hypertonic solution. Water moved from the inside of the cells to the outside of the cells to maintain homeostasis.

• The red blood cells were placed in a hypotonic solution. Water moved from the outside of the cells to the inside of the cells until the cells burst.

The pancreas produces enzymes that aid in digestion. By what process are these digestive enzymes excreted from pancreas cells?

• osmosis

• exocytosis

• endocytosis

• diffusion

The movement of matter across a cell membrane against a concentration difference is called ​​ (a)   , and it requires (b)   .

• active transport
• energy
• passive transport
• peripheral membrane proteins
• no energy

Which represents the hierarchical organization of a multicellular organism, from least complex level to most complex level?

• cell, organ, organ system, tissue

• tissue, cell, organ, organ system

• cell, tissue, organ, organ system

• organ, cell, tissue, organ system

Escherichia coli, or E. coli, is a species of bacteria. Entamoeba histolytica, or E. histolytica, is a single-celled amoeba. What do E. coli and E. histolytica have in common? Select the correct answer.

• They live without an energy source.

• They are unable to respond to changes in their environment.

• They maintain homeostasis by cell specialization.

• They reproduce, or make more of their own kind.

In the human nervous system, the brain is an example of what level of organization?

• cell

• tissue

• organ system

• organ

In the human digestive system, the stomach, pancreas, and intestines work together. Which of the following is an example of a tissue in the digestive system?

• the stomach

• smooth muscle that lines the stomach

• nerve cells in the stomach

• enzyme molecules in the stomach