DNA molecules are composed of two nucleotide strands coiled together in a double helix. The two strands consist of sugar phosphate backbones which are connected by pairs of bases. The DNA molecules may be illustrated as follows. DNA replication involves the breaking of bonds between
Correct answer: A. Two bases
- A. Two bases
- B. Sugars and a base
- C. Phosphate and a base
- D. Sugars and phosphates
Explanation
The enzyme that cleaves the unwound DNA helix structure into two different parental strands, by breaking the hydrogen bonds between the two strands of nucleotides. It literally acts as a pair of scissors that divides the DNA nucleotide into two parental strands.DNA replication occurs through the help of several enzymes. These enzymes "unzip" DNA molecules by breaking the hydrogen bonds that hold the two strands together.Each strand then serves as a template for a new complementary strand to be created. Complementary bases attach to one another (A-T and C-G).
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Scientific reasoning evaluates hypotheses through observations, variables, controls, measurements and experimental results. Questions involve identifying independent and dependent variables, recognising a fair test, interpreting tables or graphs, distinguishing evidence from opinion, and deciding whether data supports, rejects or leaves a hypothesis unresolved.
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