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mutagens, including radiation sources and chemical mutagens. Question 4.2 With reference to base cross-linking, which, if any, of the following statements, is false? a) Base cross-linking means that covalent bonds form between two bases. b) The cross-linked bases are on opposing DNA strands.Which of the following is TRUE with respect to mutations? a) Transitions and transversions are equally likely b) All substitutions are caused by chemical mutagens c) All insertions, deletions, and rearrangements are caused by spontaneous events d) All of the above are true e) None of the above are trueD. Chemical mutagens show specificity with respect to the gene that they can mutate. E. A chemical mutagen, such as the deaminating agent nitrous acid, manifests its effect following DNA replication. 4. Which of the following statements about DNA repair mechanisms is FALSE? A. Light repair can only repair thymine dimer damage.There are two types of mutagens: chemical mutagens and physical mutagens. The different types of chemical mutagens include base analogues, chemicals that change hydrogen bonding, alkylating agents,...Mutations. A mutation is a change in gene structure and can occur because of a deletion, insertion, or rearrangement in a gene section or that of the chromosome.

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A mutagen that is incorporated into. DNA in place of a normal base. 1. Frameshift mutagen _____ b. A mutagen that causes the formation of highly reactive ions. 2. Nucleoside analog _____ c. A mutagen that alters adenine so that it base-pairs with cytosine. 3. Base-pair mutagen _____ d. A mutagen that causes insertions. 4. Ionizing radiationWhich of the following is TRUE with respect to mutations? a) Transitions and transversions are equally likely b) All substitutions are caused by chemical mutagens c) All insertions, deletions, and rearrangements are caused by spontaneous events d) All of the above are true e) None of the above are trueLeon E. Rosenberg, Diane Drobnis Rosenberg, in Human Genes and Genomes, 2012 G 1 to S. When chemical mutagens or radiation damage DNA during G 1, DNA replication is postponed until the damage is repaired.The key molecular species that operates this checkpoint is a protein called p53. p53 is a transcription factor that induces the expression of DNA-repair genes.mutagen. a _____ is an infectious protein and is simpler than a virus. prion. select all of the following that are true with respect to genomes. -in eukaryotic cells, the genome usually consists of just one circular DNA molecule -in prokaryotic cells, the genome is usually divided up into multiple chromosomes

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Which of the following is TRUE with respect to mutations? A) Transitions and transversions are equally likely B) All substitutions are caused by chemical mutagens C) All insertions, deletions, and rearrangements are caused by spontaneous events D) All of the above are true E) None of the above are trueWhich of the following is true with respect to mutagens? A. Mutagens are chemical or physical factors that increase the rate of mutation. B. Mutagens are the genes that cause mutation. C. Mutagens are inheritable characters that develop mutation. Answer Save. 3 Answers. Relevance. Anonymous.These mutations can be called "gain-of-function," or dominant, mutations, because overexpression is the result. Even though we possess two copies of each proto-oncogene, only one must be mutated to lose control of the cell cycle. In general, whatever a proto-oncogene does, an oncogene does it better.True / False: Statement : DNA stands for deoxyribonucleic acid. One complete DNA molecule consists of a single helix. The building blocks of DNA are called nucleotides. One nucleotide is composed of two parts: a sugar and a nitrogen base. The sugar in DNA is called ribose. True / False: Statement : With respect to the bases, A binds with T andA mutagen that is incorporated into. DNA in place of a normal base. 1. Frameshift mutagen _____ b. A mutagen that causes the formation of highly reactive ions. 2. Nucleoside analog _____ c. A mutagen that alters adenine so that it base-pairs with cytosine. 3. Base-pair mutagen _____ d. A mutagen that causes insertions. 4. Ionizing radiation

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