25) The three-base sequence on DNA that codes for an amino acid is called a/an A) primer. B) exon. C) anticodon. D) intron. E) codon. 26) The nontranscribed region of DNA to which RNA polymerase binds to initiate transcription is called the A) promoter. B) operator. C) operon. D) exon. E) intron. 27) RNA molecules differ from DNA molecules because only RNA A) has ribose. B) has uracil. C) is typically one strand of nucleotides. D) does not have thymine. E) All of the choices are correct. 28) Which of the following is incorrect about transfer RNA? A) tRNA has a bottom hairpin loop with an anticodon. B) An anticodon is complementary to a codon. C) tRNA contains a binding site for an amino acid. D) The initiator tRNA that binds to the P site has the anticodon UAC. E) Initiator tRNA in bacteria carries tryptophan. 29) If a codon for alanine is 5'-GCA-3', what is the anticodon? A) 5'-GCA-3' B) 3'-CGT-5' C) 5'-ACG-3' D) 3'-CGU-5' E) 5'GCU-3' 30) A sequence of bases within a gene that will be transcribed, but removed from the transcript prior to translation is a/an A) promoter. B) operator. C) operon. D) exon. E) intron. 31) Which is incorrect about inducible operons? A) Have genes turned off by a buildup of end product B) Often encode enzymes for catabolic pathways C) Are normally turned off D) Are turned on by the substrate of the enzyme E) Include the lac operon 32) The gene of an operon that codes for a protein repressor is called the A) operator. B) structural locus. C) regulator. D) promoter.
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Which of the following is incorrect about DNA? A)It is a double helix. B)It codes for proteins. C)It is found in the nucleus. D)It is found in the cell. Show more…
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27. Write the sequence of RNA that is complementary to DNA with the following sequence: DNA: -T A C G C A T G A- RNA: - _______ - 28. Newly synthesized pre-mRNA contains _______ that code for proteins and _______ that do not code for proteins. 29. After transcription, pre-mRNA is modified into mature mRNA by adding _______ and _______, and by removing _______ through splicing. 30. pre-mRNA can be spliced in several ways. This is called _______, and is more responsible for a species complexity than is the number of genes or chromosomes. 31. A codon is a sequence of three nucleotides located in the _______. There are _______ codons for 20 amino acids so that mutation of one nucleotide does not always change the amino acid. 32. The start codon is _______, it codes for the amino acid _______. 33. The function of tRNA is to transfer an _______ to the protein assembly line. 34. An anticodon is a sequence of three nucleotides located in the _______. If a codon is GAC, the anticodon should be _______. 35. There are less anticodons than codons. The _______ hypothesis suggests that the 3rd nucleotide of anticodon does not need to be strictly complimentary to codon. 36. Ribosome have three tRNA binding sites: _______, _______, and _______ Ribosomes join _______ together into peptide while scanning down mRNA. Since multiple ribosomes can bind to mRNA simultaneously, a _______ typically forms during translation. 37. Some peptides contain a _______ sequence at the newly synthesized end. This sequence directs ribosomes to attach to
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