Please answer fast !: Which of the following organelle pairs could ONLY be in a plant? A. Nucleus and chloroplasts B. Cytoplasm and cell membrane C. Nucleus and mitochondria D. Ribosomes and nucleus

What did not occur in the proterozoic eon a)the oxygen levels increase greatly in the atmosphere, b)the emergence of the eukarya , c)muti cella’s eukaryotic organisms began to diversify, d)anaerobic bacteria kept thriving with more oxygen

How many copies of genes do gametes have?

Pls me i need this ! each cell has genes activated depending on it's job and what kind of cell it is. it is the presence of that causes the repressor protein to fall off and unblock the gene on the lac operon. if a gene is turned on then it is being an additional circular chromosome found in some bacteria that is used in genetic engineering.