The first question describes a plant cell.
For the second one I'm pretty sure every cell has a vacuole. If it doesn't have a cell wall that means that it isn't a plant cell. Chloroplasts is also found in plant cells. I hope that narrows down some choices for you!
There are 454 grams in a pound.15 ounces in a pound.
How many grams are in an ounce?
There are 454/15= 30.266666666... grams in an ounce.
The rounded answer would be 30.27.
Note, there are 16 ounces in a pound, so I'm not sure if you intentionally made it 15.
Since there are 16 ounces in a pound, 454/16= 28 3/8 grams in an ounce.