The diagram below shows how a paramecium maintains homeostasis. A paramecium normally lives in a hypotonic environment in which water continually diffuses into the cell. To maintain homeostasis, the paramecium must pump out large amounts of water using its contractile vacuole.

If the paramecium is then places in a hypertonic environment, which of the following will occur?

Which of these statements best explains the process of energy conversion that takes place in the mitochondria?

Which cellular process takes place in the ribosomes that are bound to the endoplasmic reticulum?

Which group of organelles is directly responsible for the production of new molecules within a cell?

The cellular process known as a 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 a cell for every two potassium ions that it moves into the cell. Which of these best explains why energy is needed for active transport?

Cells can generate as many as 36 - 38 molecules of adenosine triphosphate (ATP) from the metabolism of one molecule of glucose. Which cellular process results in this amount of ATP production

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 places in different solutions.

Which statement best describes the role of the cell membrane in this model?

In the early 1900s a scientist hypothesized a link between DNA and the production of proteins in the cytoplasm. However, the fact that DNA could not be found outside the nucleus led scientists to believe that another substance was also involved int he synthesis of protein in the cytoplasm. In the 1940's scientists performed an experiment that ultimately identified the site of protein synthesis. They also identified the molecule responsible for transporting information from the nucleus to the site of protein synthesis. What was this newly identified molecule?

This diagram shows cellular activity across a cell membrane. Which two processes does this diagram most directly model?

Which molecule synthesized by plants is a major source of energy for cellular processes in both plants and animals?