Celery stalks that are immersed in fresh water for several hours become stiff. Which of the following statements best explains the observation that similar stalks left in a 0.15 M salt solution become limp?

Zinc is an essential trace element for most organisms. Zinc is required in the active site of the enzyme carboxypeptidase where it most likely functions in which of the following ways?

Use the following information to answer the question below. Screen Shot 2020-10-12 at 3.03.05 PM.pngThe figure illustrates the energy states associated with the reaction A + B ↔ C + D. Which of the following terms best describe the forward reaction in the figure?

In Theodor W. Engelmann why do aerobic bacteria congregated in the areas illuminated by the red and blue light?

Which of the following statements best describes the normal tonicity conditions for typical plant and animal cells in their native environments?

Which of the following organelles plays a primary role in the digestion of bacteria engulfed by white blood cells?

Which of the following organelles plays a primary role in the digestion of bacteria engulfed by white blood cells?

The 3-D structure of an enzyme composed of a single polypeptide chain includes a large substrate-binding domain. It also has a separate binding site for a regulatory molecule. Based on these structural observations the enzyme is most likely regulated by which of the following mechanism?

Researchers discovered that carbon fixation in spinach leaves utilizes 45,000 molecules of ATP and 30,000 molecules of NADPH in an hour. The deficit in ATP required for carbon fixation is most directly made up for by which of the following processes?

The liver is involved in detoxification of many poisons and drugs. Which of the following structures is abundant in liver cells and primarily responsible for detoxification processes?