Which pair of structures would provide a positive identification of a plant cell under a microscope? 1. plasma membrane, large central vacuole

2. cell wall, mitochondria

3. ribosomes, chloroplasts

4. cell wall, chloroplast

Which would best keep the oxygen cycle stable? a. cutting down jungles to create farmland b. eliminating parks in large cities c. dumping toxic chemicals into the ocean d. reducing the amount of deforestation d. reducing the amount of deforestation

What is the process of a new plant growing from its seed into a seedling? primary growth fertilization pollination germination

The small molecule cyclic amp (camp) takes about 0.2 second to diffuse 10 μm, on average, in a cell. suppose that camp is produced near the plasma membrane on one end of the cell; how long will it take for this camp to diffuse through the cytosol and reach the opposite end of a very large cell, on average? assume that the cell is 200 μm in diameter.