LearnCube makes it easy to control an online class with the Raise Hand button on the top nav bar.
Students can press this button at any time during the class if they need to ask a question or if you’re asking them a question that you require immediate answers. This means only one student talks at a time.
As a teacher, you'll see a notification and the students avatar will bounce at the bottom of the class page. Clicking on the avatar will stop it from bouncing and "lower" the raised hand.