Question

1. how does the structure of the phospholipid bilayer contribute to its function? a. the hydrophobic tails face inward, creating a barrier to most water - soluble substances. b. the hydrophilic heads face inward, allowing easy passage of water - soluble substances. c. the hydrophilic heads face outward, creating a barrier to all substances. d. the hydrophobic tails face outward, repelling water. 8. what happens to pyruvate after glycolysis if oxygen is present? a. it is broken down into carbon dioxide in the cytoplasm. b. it is transported into the mitochondria to enter the citric acid cycle. c. it is directly used to generate atp in the nucleus. d. it is converted back into glucose. 9. what role does oxygen play in the electron transport chain? a. it breaks down glucose into pyruvate. b. it transports pyruvate into the mitochondria. c. it combines with electrons and hydrogen ions to form water. d. it is converted into atp. 10. what structural feature of the cell membrane allows it to be selectively permeable? a. its rigid outer layer. b. the double - helix structure of dna. c. the presence of channels and pores. d. the fluid inside the nucleus. 11. what is the main product of the light - dependent reactions? a. glucose. b. oxygen. c. water. d. carbon dioxide. 12. what can result from the improper distribution of chromosomes during meiosis in an embryo? a. enhanced tissue growth. b. developmental abnormalities or birth defects. c. reduced cell size. d. increased metabolic rate. 13. what role does dna play in the cell? a. provides a medium for organelles to function. b. controls the movement of substances in and out of the cell. c. stores energy for the cell. d. contains genetic instructions for cell development and functioning.

Explanation:

1. Phospholipid bilayer: Hydrophobic tails face inward creating a barrier to most water - soluble substances, which is the correct function - related structure feature.
2. After glycolysis with oxygen present, pyruvate is transported into the mitochondria to enter the Citric Acid Cycle.
3. In the Electron Transport Chain, oxygen combines with electrons and hydrogen ions to form water.
4. The presence of channels and pores in the cell membrane allows it to be selectively permeable.
5. The main product of the light - dependent reactions is oxygen.
6. Incorrect distribution of chromosomes during meiosis or in embryos can lead to developmental abnormalities or birth defects.

Answer:

1. a. The hydrophobic tails face inward, creating a barrier to most water - soluble substances.
2. b. It is transported into the mitochondria to enter the Citric Acid Cycle.
3. c. It combines with electrons and hydrogen ions to form water.
4. c. The presence of channels and pores.
5. b. Oxygen
6. b. Developmental abnormalities or birth defects