41. The correct amino acid sequence of a polypeptide is achieved as a result of: a) the binding of two amino acids to a

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41 The Correct Amino Acid Sequence Of A Polypeptide Is Achieved As A Result Of A The Binding Of Two Amino Acids To A 1 (64.46 KiB) Viewed 10 times

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 45. Point mutations fall into two general categories: a) depurination/deamination b) radiation / chemical c) base-pair substitution / base-pair insertions or deletions d) ionizing mutations/ non-ionizing mutations 46. Base-pair insertions or deletions, if one or more base pairs are added or deleted leads to a) frameshift mutation b) purination mutation c) amination mutation d) ionizing mutation 47. Most present day geneticists believe that variation among organisms resulted from random mutations that sometimes happen to be adaptive a) true b) false 48. Non lonizing radiation does not induce mutations except for a) ultrasound b) microwave c) fluorescent light d) ultraviolet light 49. This is an invisible, inert radioactive gas with no smell or taste; it is the second most frequent cause of lung cancer after cigarette smoking a) carbon dioxide b) helium c) radon d) zenon