Biology 203 Final Exam Completely Solved(RATED A+)

Ribozymes - ANSWER RNA molecules that function as enzymes Primary transcript - ANSWER the initial RNA transcript from any gene, including those specifying RNA that is not translated into a protein mRNA - ANSWER an RNA molecule that carries a genetic message from the DNA to the protein-synthesizing machinery of the cell template strand - ANSWER One of the two DNA strands (out of the two) that gets transcribed-- it provides the pattern or template for the sequence of nucleotides in an RNA transcript spliceosome - ANSWER made up of proteins and snRNPs-- it interacts with certain sites along an intron, then releases the intron and then joins the two exons that previously "flanked" the inron codons - ANSWER are the mRNA triplets that are written in the 5' to 3' direction promotor - ANSWER The DNA sequence where RNA polymerase attaches and initiates transcription terminator - ANSWER in bacteria-- signals the end of transcription 5' cap - ANSWER a modified guanine nucleotide, that is added after transcription of the first 20-40 nucleotides transcription unit - ANSWER the stretch of DNA that is transcribed into an RNA molecule transcription factors - ANSWER regulate transcription-- some function as repressors that inhibit expression of a particle gene THEY MEDIATE THE BINDING OF RNA POLYMERASE AND THE INITIATION OF TRANSCRIPTION-RNA polymerase II only binds to the promotor once the transcription factors are attached to it polyA tail - ANSWER when the 3' end is modified before the mRNA exits the nucleus-- enzyme adds 50-250 more adenine nucleotides that form this tail TATA box - ANSWER a nucleotide sequence that helps form the initiation complex in a eukaryotic cell exon - ANSWER the OTHER region-- are eventually expressed by being translated into amino acid sequences