Both glycolysis and Krebs cycle produce a net of 2 ATP each at the end of their cycles. Both cycles also produce reduced coenzymes for electron transport. They produce NADHs (the only difference is that Krebs produces 6NADHs while glysolysis produces 2NADHs).
Increasing plant biomass decreases the amount of co2 in the atmosphere
-I hope that is correct<span />
This is because not all genes are expressed at the same time, so not all the proteins are present at a certain moment. The mechanisms that cell uses to control gene expression are called regulation of the gene expression. Thanks to regulation of the genes, cells have the ability to increase or decrease the production of specific gene products such as proteins. This property is important for the adaptability of an organism because it allows the cell to express protein when needed.