Are Roman Catholics still suppose to believe in transubstantiation?

Yes, just like the other 23 different Catholic Rites do. Why wouldn't the Roman Rite also believe in it?

Of course. It has been a central belief of true Christianity since Jesus Himself celebrated it at His Last Supper with His Apostles, and will be central to Christianity until the end of time.

Probably. It's just one of their many silly beliefs. 

Yup, "And He took the bread, gave thanks and broke it, and gave it to them, saying, “This is My body, given for you; do this in remembrance of Me." In the same way, after supper He took the cup, saying, “This cup is the new covenant in My blood, which is poured out for you.…"

The (protestant) kjv says Whoso eateth my flesh, and drinketh my blood, hath eternal life; and I will raise him up at the last day. For my flesh is meat indeed, and my blood is drink indeed.... This is my body. And he took the cup, and gave thanks, and gave it to them, saying, Drink ye all of it; For this is my blood..." Where does it say: " nope. jk. only symbolic."

  Catholics still believe in many false teachings. :

Trinity

Immortal soul

Eternal torment in hell

Mary is the mother of God

etc..

Hate to say this but the Eucharist is a left over from primitive cannibalistic practices. The eating of the brain of an elder to gain his knowledge and wisdom... 

There was nothing new in Christianity .... Just old silliness...

What do you mean "suppose" [sic]?  They DO believe in transubstantiation.

They believe in raping tens of thousands of children in their church basements.

Yes, that is official Catholic church doctrine.