The types of proteins produced by the ribosomes is another one of the differences between free and bound ribosomes. Free ribosomes produce proteins that are used by the cell. This includes proteins that are used for the metabolism of food. The free ribosomes produce enzymes involved in the metabolism of glucose.
The IRS recommends keeping records for â3 years from the date you filed your original return or 2 years from the date you paid the tax, whichever is later.â You should also keep records for three years if you owe additional tax and the situations described in sections 3 and 4 below donât apply.he types of records you should keep are anything related to your income (e.g., W-2s, 1099s, bank and brokerage statements), expenses (e.g., receipts, canceled checks and invoices) and home-related records (e.g., purchase receipts, closing records, insurance records and proof of improvements).
Credit card receipts and statements. Length of time to keep, and why:From 45 days to seven years. 1  Keep your original receipts until you get your monthly statement; shred the receipts if the two match up.  Keep the statements for seven years if tax-related expenses are documented.