SOLVED

25. The DNA of a _______ is wrapped around histone molecules to form a “beaded string.” A. prokaryote B. eukaryote C. bacterium D. All of the answer choices are correct. 26. Identify the major tumor suppressor gene that is more frequently mutated in human cancers than any other known gene. A. p53 gene B. hemoglobin gene C. ras oncogene D. p16 E. RB tumor-repressor gene 27. Thymine dimers A. form when DNA is exposed to carcinogens such as tobacco smoke. B. are rarely removed by DNA repair enzymes. C. form when DNA is exposed to UV radiation. D. result in abnormal protein structure which causes red blood cells to sickle. 28. Transposons A. are specific DNA sequences that move within and between chromosomes. B. alter the expression of neighboring genes especially if the transposon is a regulator gene. C. have been discovered in corn, fruit flies, bacteria, and humans. D. All of the choices are correct. 29. Point mutations A. are due to a change in one DNA nucleotide. B. may change a specific codon. C. can cause a genetic disease such as sickle cell disease that is due to a base change that codes for valine rather than glutamate. D. All of the choices are correct. Â Â