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. Which of the following is the correct matching of base pairs in DNA?
Correct answer: A. Adenine - Thymine and Guanine - Cytosine
- A. Adenine - Thymine and Guanine - Cytosine
- B. Guanine - Thymine and Adenine - Cytosine
- C. Adenine - Guanine and Thymine - Uracil
- D. Guanine - Cytosine and Thymine - Uracil
Explanation
DNA (deoxyribonucleic acid) is consists of adenine, thymine, cytosine, and Guanine. Adenine bonded by two hydrogen bonds with thymine and guanine is bonded by three hydrogen bonds with cytosine. Thus, the correct answer is A.
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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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