RNA is the key molecule involved in protein synthesis. During translation, the mRNA binds to a ribosome carrying a sequence of codons. The tRNA then binds to the ribosome/mRNA complex with the matching anticodon. The anticodon contains the three complimentary nucleotides to the codon.

Prokaryotes do not have nuclei. It is translation, not transcription, that occurs on ribosomes. tRNA is the type of RNA that brings amino acids to the ribosome; again, translation is the process of protein synthesis from amino acids. There are many differences between eukaryotic and prokaryotic transcription! These differences are monumental in differentiating between eukaryotes and prokaryoes. For example, in eukaryotes, transcription occurs in the nucleus and involves mRNA processing—adding a 5' cap, adding a 3' poly-A tail, and splicing out introns; none of these things are true for prokaryotes.

The genetic code is based on codons, which are sets of three nucleotides. mRNA is read in the triplet code; each codon specifies for an amino acid. The genetic code is redundant (one amino acid may be coded for by multiple codons), but each codon only codes for one amino acid, or the stop codon.

Ubuiqitin is a protein synthesized to tag worn out or defective proteins for recycling. Since this would only eliminate proteins that have already been synthesized, it would be more of a translational regulation process. 

The other choices are common transcription regulators. Chromatin remodeling complexes are proteins that interact with the histones in chromatin. They are able to expand or condense the amount of coiling around histones and therefore allow greater or lesser access by transcription machinery to the DNA; thus, when the DNA is more tightly bound, it is less accessible and transcription is regulated. Our genes are broken into coding and non-coding sequences called exons and introns respectively. Alternative splicing is a process that alters the mRNA transcription product by selecting different combinations of exons to be joined together. This is an important process and allows the body to produce many more proteins than it normally would from the same quantity of genes. DNA binding motifs and their associated proteins are called transcription factors when interacting and they regulate transcription. They regulate by blocking a genes' promoter region (reduces the expression of that sequence) or they bond to the promoter to help the transcription machinery recognize that sequence and assemble itself (increases expression). Last, repressor proteins bond to promoter regions of genes they regulate. Often times the product of that gene is responsible for activating and inactivating that repressor. For example, a large quantity of a gene product can make it more likely for the repressor and that gene product (protein) to meet and join. This activity generally turns repressors on and transcription of that gene is reduced or stopped.

rRNA forms ribosomes.

tRNA is transport RNA, it joins amino acids to ribosomes to assemble a protein molecule

SnRNA is small nuclear RNA, it splices pre-mRNA to form mRNA

miRNA is microRNA, which regulates gene transcription and translation

mRNA is messenger RNA, carries the genetic code for controlling the protein formed.

The full names of the sugars used in nucleic acid structures are ribose (for RNA) and deoxyribose (for DNA). Both sugars have five carbon atoms arranged in a ring. In ribose, the carbon in the 2' position is bound to a hydroxyl group (-OH). In deoxyribose, however, the 2' carbon is bound to a simple hydrogen atom. 

DNA (deoxyribonucleic acid) and RNA (ribonucleic acid) have backbones that are identical, except that the five-carbon sugar in RNA (ribose) has one oxygen that the sugar in DNA (deoxyribose) lacks.

Hydrogen bonding is no different between the two molecules, and primarily serves to bind nitrogenous bases rather than regions of the backbone.

Peptide bonds are not formed in DNA or RNA. Rather, these bonds are used to connect the amino acid monomers in a protein molecule.

Uracil is found in RNA and not in DNA, but does not impact the backbone.

Phosphodiester bonds are used to bind adjacent nucleotides together in both DNA and RNA.

RNA differs from DNA in that it has a single helix, and that instead of thymine, it contains uracil.

Although RNA and DNA have some key differences that result in different functions, they also have some key similarities. Both are composed of nucleotide monomers linked together by phosphodiester bonds. They are also both read in the 5'-3' direction. It is important to know that the backbone of both DNA and RNA is made by phosphodiester bonds, but it is hydrogen bonds that bind two strands to DNA together to form the double-helix.

DNA and RNA both use adenine, cytosine, and guanine, but only DNA uses thymine and only RNA uses uracil. Only DNA is double-stranded; RNA is single-stranded. Deoxyribose, in DNA, is deoxygenated at the 2' carbon, but ribose in RNA is oxygenated.

DNA uses four nitrogenous bases: adenine, thymine, cytosine, and guanine. Adenine residues bond to thymine residues, and cytosine binds to guanine.

During transcription, DNA is used as a template to generate mRNA. During this process, bases are matched to the DNA template and used to build a single strand of RNA. In RNA, there are also four nitrogenous bases: adenine, cytosine, guanine, and uracil. Thymine is not found in RNA.