Alicia volunteered to become an organ and tissue donor when she got her state ID. If Alicia dies, she can help to improve others’ lives. Her heart tissue, skin, bones, and veins can all be transplanted into a patient in need. Choose the word that correctly completes the sentence.

A group of similar cells make up a tissue. Several tissues make up an ________.

All the organelles in a cell work together to help the cell and the whole organism function. Some diseases are caused by the failure of one type of organelle. Read the description below of an example of this type of disease. Lauren has cystic fibrosis. Her body is unable to control the flow of salt into and out of her cells. Lauren’s symptoms include coughing and wheezing when she tries to exercise. She receives breathing treatments that let her swim, dance, and sing. Which organelle is affected by Lauren's disease?

All the organelles in a cell work together to help the cell and the whole organism function. Some diseases are caused by the failure of one type of organelle. Read the description below of an example of this type of disease. Joe’s cells can’t convert food energy effectively into energy they can use. As a result, he gets extremely tired, has weak legs, and can’t breathe well. Joe swims every day to keep his body as strong as possible. Which organelle is affected by Joe's disease?

All the organelles in a cell work together to help the cell and the whole organism function. Some diseases are caused by the failure of one type of organelle. Read the description below of an example of this type of disease. Joe’s cells can’t convert food energy effectively into energy they can use. As a result, he gets extremely tired, has weak legs, and can’t breathe well. Joe swims every day to keep his body as strong as possible. Which organelle is affected by Joe's disease?

All the organelles in a cell work together to help the cell and the whole organism function. Some diseases are caused by the failure of one type of organelle. Read the description below of an example of this type of disease. A mosaic is a picture made up of small colored pieces. Mosaic viruses cause plant leaves to look like mosaic art. A mixture of dark and light green patches appear on the leaves. The light green patches are not able to capture much energy from sunlight. Which organelle is affected by mosaic viruses?

Mad cow disease is caused by deformed proteins called prions. The disease is spread when meat from an infected cow is eaten. Prions can make normal proteins deform into more prions. After a few years, the brain of an infected person or cow looks like a sponge full of holes. Are prions considered organisms?

Mad cow disease is caused by deformed proteins called prions. The disease is spread when meat from an infected cow is eaten. Prions can make normal proteins deform into more prions. After a few years, the brain of an infected person or cow looks like a sponge full of holes. Are prions considered organisms?

Before a new medicine is approved, scientists study the effects the medicine has on different parts of the body. Often, a medicine is tested on mice before it is tested on humans. All the cells in the illustration below came from the same mouse.

If all of these cells are mouse cells, why do they look so different from each other?

Your body is made up of trillions of cells that perform all the functions you need to survive. Which other kinds of organisms are composed of cells?

Several kinds of specialized cells work together to create the sense of hearing. Hair-shaped cells sense vibrations and nerve cells send signals to the brain. Structural cells hold the hair cells in place. No matter their specialty, which functions must all cells perform to survive? Choose the three statements that apply.

Terry and James are partners in a mystery lab. The boys have a compound light microscope and several unlabeled slides. Their task is to find out everything they can about the samples on the slides. Terry puts a slide on the microscope stage and focuses the lenses on the sample. He can see that the sample is made up of tiny cells.

Even without knowing anything else about the cells he sees, what can Terry reasonably conclude about them?

Terry and James are partners in a mystery lab. The boys have a compound light microscope and several unlabeled slides. Their task is to find out everything they can about the samples on the slides. Terry puts a slide on the microscope stage and focuses the lenses on the sample. He can see that the sample is made up of tiny cells.

Terry wishes he could magnify the cells even more so he could see more details. He suggests, “If we had an electron microscope, we could see all of the cells inside these cells, and even the cells inside those smaller cells!” James disagrees with Terry's thinking. What is wrong with Terry’s suggestion?