The human stomach has an acidic environment. Which enzyme with its optimal pH below most likely functions in the stomach?

Meat tenderizer is made with pepsin, an enzyme. If meat coated with tenderizer is placed in a refrigerator for a short time prior to cooking, how will the enzyme pepsin be affected?

Spartina grows in salt marshes and stores salt in its roots. This makes the salt concentration in its roots greater than that of the surrounding water. What most likely occurs in response to this salt concentration in the roots?

Which pond has the most basic water?

Researchers have discovered a toxin that stops cells from releasing stored energy. Cells exposed t this toxin cannot carry out many of their normal processes. When cells are exposed to this toxin, which of these would be least affected?

A cell that normally lives in a 10% saltwater solution was moved into another solution. Which of these solutions would cause the cell to increase in size at the greatest rate?

Which of these substances moves across cell membranes by osmosis?

Enzymes will stop functioning if...

On a hot summer day, diffusion will occur

Diffusion occurs when substances move from areas of ___ concentration to areas of ___ concentration to reach equilibrium.

Starch turns blue-black in the presence of iodine. A selectively permeable dialysis sac containing a starch solution is placed into a beaker of iodine solution. The movement of water into the sac is called

The cell membrane will allow water, oxygen, carbon dioxide, and glucose to pass through. Because other substances are blocked from entering, the membrane is called

The structure most responsible for maintaining cell homeostasis is the

Which of these substances moves across cell membranes by osmosis?

Which Pond has the most acidic water?

Which of these is most affected in the cells of the goldfish when the water temperature is lowered?

Starch turns blue-black in the presence of iodine. If a dialysis sac with starch solution is permeable only to water and iodine and is placed in a beaker of iodine solution, what will the solutions in the beaker and the sac look like after two hours

Starch turns blue-black in the presence of iodine solution. A selectively permeable dialysis sac containing a starch solution is placed into a beaker of iodine solution. Which process is described?

A scientist believes that a factory has been dumping acid into a local river. To test this hypothesis, which property of water should the scientist monitor?

A student conducted an experiment by boiling liver (has catalase) and added it to hydrogen peroxide (HO3) solution. Catalase breaks down HO3.She observed that little to no oxygen was released. Which statement best supports the student's observations?

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