4 Written questions
3 Multiple choice questions
- The duplication, or copying, of a DNA molecule. DNA replication begins when the hydrogen bonds connecting the two strands of DNA are broken, causing the strands to unwind and separate. Each strand is then used as a template for the construction of a new strand of DNA.
- A pair of complementary nitrogenous bases that have formed hydrogen bonds with each other.
- The structure of DNA, in which two long strands of covalently bonded nucleotidesare held together by hydrogen bonds and
twisted into a spiral coil.
3 True/False questions
DNA repair → A three-step process in which damage to DNA is repaired. Damaged DNA is first recognizedthen removed, and then replaced with newly synthesized DNA.
DNA sequence → The sequence, or order, in which the nitrogenous bases adenine (A), cytosine (C), guanine (G), and thymine (T) are arranged in a gene or a DNA fragment, or in an organism's genome.
mutagen → A form of programmed cell death that generally benefits the organism.