Presentation on theme: "Science Starter 2.13&17.15 1. How do the functions of the nucleus differ from those of the cell membrane? A.The nucleus converts food energy while the."— Presentation transcript:
Science Starter 2.13& How do the functions of the nucleus differ from those of the cell membrane? A.The nucleus converts food energy while the cell membrane stores minerals and wastes. B.The nucleus controls the activities of the cell, while the cell membrane controls what enters and exits the cell. C.The nucleus provides support, while the cell membrane converts carbon dioxide and water into food. D.The nucleus stores food and water, while the cell membrane stores chemicals used by the cell for photosynthesis.
2. Chloroplasts are organelles that are found in plant cells. Some plant tissue contain cell with large numbers of chloroplasts, while other tissue contains few chloroplasts. Which type of plant tissue contains cells with many chloroplasts and why? A. Stem B. Root C. Leaf D. Flower
* Plants are autotrophs - they make their own food. * They use a process of photosynthesis to convert energy from the sun in the form of EMR into glucose. * Glucose stores the chemical energy until needed by the plant. * Photosynthesis takes place in the chloroplasts found in plant cells.
* 2 main parts surrounded by membranes * Grana - stacks of Thylakoids “coins” * Stroma - aqueous space between the grana
* Converts sunlight energy into food for the plant. * Takes place in the chloroplasts * Has a light (grana) and dark (stroma) reaction * Formula for photosynthesis 6CO 2 + 6H 2 O -> C 6 H 12 O 6 + 6O 2
Now what uses the glucose made during photosynthesis?
* the process that releases energy by breaking down glucose and other food molecules in the presence of oxygen to make ATP * Cellular respiration happens in the mitochondria.
* Because cellular respiration occurs when oxygen is present, we call this aerobic respiration.
* All living organisms need energy to grow, move, and reproduce. * We get that energy from sugars like glucose. * We change energy stored in food to make ATP (a different form of energy) our bodies can use
How does this relate to ATP?
* Some cells, like muscles, are more active & have more mitochondria because they need to make more energy
* C 6 H 12 O 6 + 6O 2 6CO 2 + 6H 2 O + energy * Glucose + oxygen carbon dioxide + water and energy (ATP) * Hey Look! It’s the opposite of photosynthesis!
* Both animals (heterotrophs) and plants (autotrophs) do cellular respiration. * If oxygen is not present then a process called fermentation occurs.
When you exercise hard, and have trouble breathing you aren’t getting enough oxygen. When there’s no oxygen, lactic acid is formed. Lactic acid is what causes your muscles to hurt or cramp after exercise.