Our skin cell has two separate centrosomes in which of the f

Our skin cell has two separate centrosomes in which of the following? A. G_2 phase B. G_1 phase C. G_0 phase D. S phase Photosystem II replaces its lost electrons by electrons from _____. A. NADH B. photosystem I C. H_2O D. FADH_2 A cell with 10 chromosomes undergoes MITOSIS. How many daughter cells are created? _____ each daughter cell has _____ chromosomes. A. 1...10 B. 2...20 C. 4...5 D. 2...10 In plants, mesophyll cells are specialized for which of the following? A. protection B. opening and closing of stoma C. photosynthesis D. transport of H_2O and sugars In order for ATP synthase to make ATP by chemiosmosis during LIGHT REACTIONS OF PHOTOSYNTHESIS, H^+ must rush through it from the _____ to the _____. A. mitochondrial matrix ... intermembrane space B. thylakoid space ... stroma C. intermembrane space ... mitochondria D. stroma ... thylakoid space In the pathway below, the end product d stops ENZYME 2 from working. What happens to the cell? A. the cell can make B but not C B. the cell can make C but not D C. the cell can make B, C, and D D. the cell cannot make B nor C All tumors and cancerous A. True B. False

Solution

1.S phase is the duplication phase and consists of two independent centrosomes.

2. The lost electron of photosystem II is replaced by water which gets oxidized to form oxygen molecule and hydrogen ion.

3. In mitosis, the cell is divided into two daughter cells, each having the same number of chromosomes as that in the parent cell. Here 2 daughter cells will form with 10 chromosomes in each.

4. The first layer of mesophyll cell is palisade parenchyma consisting of large number of chloroplasts, so its primary function is to, help in the process of photosynthesis.

5. The hydrogen ions move from thylakoid space into stroma during the process of chemiosmosis.

6. Feedback inhibition is a process where the product of a reaction is used to control the production of enzymes according to the requirement of the process. So the answer here is the cell can make B, C and D.

7. A tumor can be benign means non-cancerous or malignant means cancerous, so the answer is false.