Explain why scientists have classified protist in one kingdom when they are such a diverse group? This kingdom is necessary for the classification of all organisms that don't fit into the other kingdom categories.
Answer:
Option B, The controls on cell growth and divisions can be turned on and off
Explanation:
There are signal proteins that control and regulate the cell growth and division process. For instance, mitogens help in removing the negative controls which would otherwise have blocked the cell cycle progression. Then there are growth factors that synthesize proteins and hence stimulate cell growth. Also there are some survival factors that suppress the apoptosis. Based on these three factors the cell division and growth can be turned on or off.
Hence, option B is correct
Answer:
Sperm and egg have 23 the number of chromosomes as a body cell.
Hope this helps =)
