1. The net effect of photosynthesis, chemically, is reduction, leading to the formation of which products? a. Carbon dioxide and carbohydrates b. Carbon dioxide and protein c. Oxygen and carbohydrates d. Oxygen and ATP Study Online Instantly Click to Save 50% Now The reactants in the process of photosynthesis are carbon dioxide and water. Sunlight is needed for the reactions to occur. The products of photosynthesis are oxygen and glucose, a simple carbohydrate. ATP is used in photosynthesis but is neither a reactant nor a product. ATP is produced in a different process called cellular respiration. 2. A cell membrane is ______________? a. Permeable b. Semipermeable c. Nonpermeable d. None of the above. A cell membrane is a thin layer of molecules that surrounds the cell. Its function is to allow certain materials to enter the cell, yet, keep harmful materials out. In order to do this, the cell controls which substances can enter the cell through the membrane. The cell membrane is selectively permeable (or semipermeable), which means that certain molecules, such as oxygen and water, are permitted to enter the cell. Molecules that are not recognized as helpful are not able to pass through the membrane. 3. A cell uses which of the following to accelerate chemical reactions enabling its metabolic machinery to operate? a. Centrasome b. Lysosome c. Golgi apparatus d. Enzymes Enzymes are catalysts, chemicals that speed up chemical reactions. The conditions inside most cells do not allow reactions to proceed quickly enough to support life. For example, temperatures inside organisms are not hot enough for