Which one of the following is true of tRNA molecules? Select all that apply.

Group of answer choices

The anticodon arm of tRNA contains a three nucleotide sequence that is identical to a specific mRNA codon.

tRNA molecules contain the unusual nucleotides dihydrouridine, pseudouridine, and ribothymine.

tRNA molecules form their 3D structures due to covalent bonding.

The 3' terminal nucleotide of tRNA is the site of amino acid attachment.

tRNA molecules are single stranded RNA.