Carcinogens can damage DNA by each of the following mechanisms except
A) by binding to DNA and directly disrupting base pairing.
B) by generating cross-links between DNA strands.
C) by hydroxylating DNA bases.
D) by causing breaks in one or both strands.
E) All the above are mechanisms by which carcinogens can damage DNA.
Answer: E
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Nucleoids are supercoils of DNA forming a structure with multiple loops located within:
A. plants. B. insects. C. bacteria. D. yeast. E. protists.
Methanogens may contribute to the greenhouse effect and global warming due to methane production.
Answer the following statement true (T) or false (F)
Homologous chromosomes undergo synapsis during:a
anaphase I. b. prophase I. c. anaphase II. d. telophase II. e. prophase II
Mycobacterium leprae primarily infects
A) macrophages. B) skin cells. C) neurons. D) macrophages and skin cells. E) skin cells and neurons.