Question 55
Chromosomes, DNA and Sex LinkageIn the structure of DNA, which of the following statements is true?
- A.The double helix are held together by covalent bonds
- B.Nucleotide is made up of ribose, phosphate and an organic nitrogen compound
- C.Guanine is the opposite of cytosine
- D.Adenine is the opposite of cytosine
Show the answer and explanation
Answer: C (Guanine is the opposite of cytosine)
Explanation
The base pairs in DNA are A–T and G–C, held by hydrogen bonds; DNA sugar is deoxyribose, not ribose.