Question

Which of the following could be a nucleotide of RNA?

deoxyribose + phosphate group + thymine

deoxyribose + phosphate group + uracil

ribose + phosphate group + thymine

ribose + phosphate group + uracil

Answer 1

DNA are made up of nucleotides that have a deoxygenated ribose whereas RNA have the OH group still attached. Therefore you can eliminate the first two choices.
Next, for RNA you have to remember that the nucleotide that pairs with adenine in RNA is Uracil rather than thymine which is the nitrogenous base that pairs with adenine in DNA. so the answer is the fourth choice, hope that helps

Answer 2

ribose phosephategroup and uracil