US STOCKS-Dow, S&P 500 gain after Yellen, but Nasdaq drops
* Fed chair says U.S. economy still needs help
* Mondelez climbs after earnings, coffee deal
* Internet-related shares drop for second day
* Whole Foods tumbles after earnings, outlook
* Dow up 0.6 pct; S&P 500 up 0.2 pct; Nasdaq off 1.1 pct (Updates to early afternoon)
By Chuck Mikolajczak
NEW YORK, May 7 (Reuters) - U.S. stocks mostly rose on Wednesday, bouncing off earlier lows after comments from Federal Reserve Chair Janet Yellen offered no surprises, but the Nasdaq fell for a second straight day, weighed down by declines in Internet-related shares.
The Dow and the S&P 500 moved into positive territory after Yellen said the U.S. economy was still in need of lots of support, given the "considerable slack" in the labor market in remarks to the congressional Joint Economic Committee.
Yellen's comments enabled investors to shift attention to what may be an easing of the tensions in Ukraine, as Russian President Vladimir Putin called on pro-Moscow separatists in Ukraine to postpone a vote on secession just five days before it was to be held. Continuación...