Who reunited the Roman Empire in AD 324, moved the capital to Byzantium, renamed the capital after himself, stabilized trade by introducing the gold solidus, legalized Christianity, and called the Council of Nicaea?

Which new 7th century religion gave rise to the Muslim Empire?

Who was the third caliph of the first caliphate (Rashidun)?

Who conquered England in 1066 when the English king died without an heir but was required to defeat two Harolds to clear the way?

Cystic fibrosis is caused by a defect in a:

Cells produced by meiosis are called: 

Crossing-over occurs during which stage of meiosis?

Which was the most common occupation of the nobility during the Middle Ages?

Where is this taking place?

Which type of receptor responds to chemical substances such as taste and smell?