Answer Happy

40. Methylation of DNA and histones causes a) loose packing of nucleosomes making genes available for transcription b) nucleosomes to pack tightly together and genes are not expressed. c) DNA replication d) genes to translocate on the chromosome 41. The correct amino acid sequence of a polypeptide is achieved as a result of a) the binding of two amino acids to a specific rRNA and the binding between the codon of the mRNA and the complementary anticodon of the rRNA b) the binding of the rRNA and the RNA c) the binding of one amino acid to a specific tRNA and the binding between the codon of the mRNA and the complementary anticodon in the tRNA d) the binding of each amino acid to the anticodon of the rRNA and the codon of the mRNA 42. It's structure consists of a central carbon (alpha-carbon) to which is bonded an amino group (NH2), a carboxyl group (COOH) and a hydrogen atom a) mRNA b) DNA c) promotor d) amino acid 43. The nitrogenous base used in RNA, replaces used in DNA a) uracil/ thymine b) guanine / cytosine c) uracil guanine d) thymine/uracil 44. A gene mutation can alter the phenotype by changing the function of a) a carbohydrate b) protein c) lipid d) nucleic acid