you are way too young to be putting your long term investments in treasuries.
Yes, you want a 6mo or so rainy day fund in cash or cash equivalents like mm or short cds, in a rising rate environment short and cash are good.
For long term investments, unless you have some unusual skill or insight, I would go w/ low cost mutual funds, Vanguard, T Rowe Price and Fidelity all have some good choices.
You may also want to spend some time over at the forums at
Morningstar
If you have a 401 or 403 max it out to the company match, then max out a Roth IRA, then if you have more invest-able cash, max out the 401/403
When young bias to stock w/ a small % of bonds, hel* I am retiring very soon and still have 80/20 which is good for a 25 yr old but very aggressive for an old Fa**