Highlight some words of a beamer

\documentclass{beamer}

\begin{document}
\begin{frame}
  \frametitle{Quite Some Text}
  The following short text will be \alert{highlighted with \texttt{alert}}, while this is not.  

  \begin{alertenv}
    We can highlight entire paragraphs with the \texttt{alertenv} environment.

    See, that was a paragraph.
  \end{alertenv}

  Note though that \alert{\texttt{alert} does not complain when fed a paragraph.

  See, a new paragraph.}
\end{frame}
\end{document}