If you need to file a tax return, you should. Youâll still owe the taxes, whether or not you file. You should file your return on time, with or without a payment â the IRS can charge penalties for filing late.f you can pay the full amount now. You can pay with an electronic funds transfer or with a credit or debit card, or with a check by mailing it to the address listed on your bill or bringing it to your local IRS office.
Eukaryotic cells have evolved an endomembrane system, containing membrane-bound organelles involved in transport. These include vesicles, the endoplasmic reticulum, and the Golgi apparatus. The smooth endoplasmic reticulum plays a role in lipid biosynthesis, carbohydrate metabolism, and detoxification of toxic compounds.
Endosymbiotic theory. The endosymbiotic theory concerns the origins of mitochondria and chloroplasts, which are organelles of eukaryotic cells. According to this theory, these originated as prokaryotic endosymbionts, which came to live inside eukaryotic cells. The theory postulates that the mitochondria evolved from aerobic bacteria (probably proteobacteria, related to the rickettsias), and that the chloroplast evolved from endosymbiotic cyanobacteria (autotrophic prokaryotes). The evidence for this theory is compelling as a whole, and it is now generally accepted.