Which WordPress function should you use to add a "rel='nofollow'" attribute to any link in an HTML string?

If you create a custom form with an email field, you can check if the submitted email is valid using the following WordPress function

What file doesn't contain the current WordPress version?

When using classes, what visibility level is needed in order for WordPress to call your functions after being hooked into an action?

While running through the WordPress Loop, which action can be used to display content before each post in The Loop?

The bookmarklet included in WordPress for publishing to your site while browsing the web is called:

Using user_can() function, which capability will determine an administrator?

How to get current user ?

The function ______ displays the Featured Image (previously called Post Thumbnails) for the current post, as set in that post's edit screen.

What does the is_admin() conditional function do?

WordPress locks you into it's current version for jQuery.