A particular triplet of bases in the coding sequence of DNA is AAA. The anticodon on the tRNA that binds the mRNA codon isa.TTTb.UUAc.UUUd.AAAe.either UAA or TAA, depending on first base wobbleAlternative RNA splicinga.is a mechanism for increasing the rate of transcriptionb.can allow the production of proteins of dramatically different sizes from a single mRNAc.can allow the production of proteins of dramatically different amino acid sequences from a single mRNAd.B and C onlye.A, B, and CWhich of the following is (are) true of snRNPs?a.They are made up of both protein and RNAb.They bind to splice sites at each end of the intronc.They join together to form a large structure called the spliceosomed.Only A and C are truee.A, B, and C are trueA transcription unit that is 8,000 nucleotides long may use 1,200 nucleotides to make a protein consisting of 400 amino acids. This is best explained by the fact thata.many noncoding nucleotides are present in mRNAb.there is redundancy and ambiguity in the genetic codec.many nucleotides are needed to code for each amino acidd.nucleotides break off and are lost during the transcription processe.there are termination exons near the beginning of mRNAOnce transcribed, eukaryotic mRNA typically undergoes substantial alteration that includesa.excision of intronsb.fusion into circular forms known as plasmidsc.linkage to histone moleculesd.union with ribosomese.fusion with other newly transcribed mRNAIn snapdragons, heterozygotes have pink flowers, whereas homozygotes have red or white flowers. When plants with red flowers are crossed with plants with white flowers, what proportion of the offspring will have pink flowers?a.0% d.75%b.25% e.100%c.50%What is the sequence of a peptide based on the mRNA sequence 5' UUUUCUUAUUGUCUU 3' ?a.leu-cys-tyr-ser-pheb.cyc-phe-tyr-cys-leuc.phe-leu-ile-met-vald.leu-pro-asp-lys-glye.phe-ser-tyr-cys-leuWhat amino acid sequence will be generated, based on the following mRNA codon sequence? 5'AUG-UCU-UCG-UUA-UCC-UUGa.met-arg-glu-arg-glu-argb.met-glu-arg-arg-gln-leuc.met-ser-leu-ser-leu-serd.met-ser-ser-leu-ser-leue.met-leu-phe-arg-glu-gluA particular eukaryotic protein is 300 amino acids long. Which of the following could be the maximum number of nucleotides in the DNA template strand that codes for the amino acids in this protein?a.3b.100c.300d.900e.1800A possible sequence of nucleotides in the template strand of DNA that would code for the polypeptide sequence phe-leu-ile-val would be a.5' TTG-CTA-CAG-TAG 3' d.3' AAA-AAT-ATA-ACA 5'b.3' AAC-GAC-GUC-AUA 5' e.3' AAA-GAA-TAA-CAA 5'c.5' AUG-CTG-CAG-TAT 3'Which of the following are transcribed from DNA?a.proteinb.exonsc.rRNAd.B and C onlye.A, B, and CIntrons are significant to biological evolution becausea.their presence allows exons to be moved around more easily, creating proteins with new combinations of functional domainsb.they protect the mRNA from degenerationc.they are translated into essential amino acidsd.they maintain the genetic code by preventing incorrect DNA base pairingse.they correct enzymatic alterations of DNA basesWhich of the following is not a part of the eukaryotic transcription initiation complex?a.promoterb.RNA polymerasec.transcription factorsd.snRNPe.TATA boxWhat are the coding segments of a stretch of eukaryotic DNA called?a.intronsb.exonsc.codonsd.repliconse.transposonsAll of the following are found in prokaryotic mRNA excepta.the AUG codonb.the UGA codonc.intronsd.uracile.cytosineWhich of the following is true for both prokaryotic and eukaryotic gene expression?a.After transcription, a 3' poly-A tail and a 5' cap are added to mRNAb.Translation of mRNA can begin before transcription is completec.RNA polymerase binds to the promoter region to begin transcriptiond.mRNA is synthesized in the 3' ? 5' directione.The mRNA transcript is the exact complement of the gene from which it was copiedWhat kind of chemical bond is found between paired bases of the DNA double helix?a.hydrogen d.sulfhydrylb.ionic e.phosphatec.covalentWhich of the following helps to stabilize mRNA by inhibiting its degradation?a.TATA boxb.spliceosomesc.5' capd.poly-A taile.both C and DRNA polymerase moves along the template strand of DNA in the ________ direction, and adds nucleotides to the ________ end of the growing transcript.a.3' to 5'; 5' b.3' to 5'; 3' c.5' to 3'; 5' d.5' to 3'; 3'What is the function of DNA polymerase?a.to unwind the DNA helix during replicationb.to seal together the broken ends of DNA strandsc.to add nucleotides to the end of a growing DNA strandd.to degrade damaged DNA moleculese.to rejoin the two DNA strands (one new and one old) after replication
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