Question

1. what role does the phospholipid bilayer play in the cell membrane? a. it synthesizes proteins. b. it acts as a semi - permeable barrier, allowing selective transport of substances. c. it stores genetic material. d. it produces energy for the cell. 8. what is the significance of the citric acid cycle in cellular respiration? a. it breaks down glucose into pyruvate. b. it generates nadh and fadh2 for the electron transport chain. c. it occurs outside the mitochondrion. d. it directly produces water and oxygen. 9. which molecules can pass through the phospholipid bilayer via simple diffusion? a. large polar molecules like glucose b. ions like sodium and potassium c. proteins d. small nonpolar molecules like oxygen and carbon dioxide

Explanation:

Question 7:

The phospholipid bilayer of the cell - membrane acts as a semi - permeable barrier, controlling the movement of substances in and out of the cell. Protein synthesis occurs in ribosomes, genetic material is stored in the nucleus, and energy production occurs mainly in mitochondria.

Question 8:

The Citric Acid Cycle generates NADH and FADH2 which are used in the Electron Transport Chain to produce ATP. Glucose is broken down into pyruvate in glycolysis, and the Citric Acid Cycle occurs in the mitochondria. It does not directly produce water and oxygen.

Question 9:

Small non - polar molecules like oxygen and carbon dioxide can pass through the phospholipid bilayer via simple diffusion. Large polar molecules, ions, and proteins generally require transport proteins to cross the membrane.

Answer:

1. b. It acts as a semi - permeable barrier, allowing selective transport of substances.
2. b. It generates NADH and FADH2 for the Electron Transport Chain.
3. d. Small nonpolar molecules like oxygen and carbon dioxide