Name: DNA Structure Student Practice (12. 1) Modified True/False Statements: If the statement true, write True in the blank. If the statement is is false, write False in the blank and correct the underlined word to make the statement true. The building blocks of DNA molecules are amino acids. DNA molecules contain a 5-carbon sugar called deoxyribose. The nitrogen bases found in DNA molecules include adenine, cytosine, guanine,

- The building blocks of DNA molecules are amino acids. False

- DNA molecules contain a 5-carbon sugar called deoxyribose. True

- The nitrogen bases found in DNA molecules include adenine, cytosine, guanine, and thymine. True

Explanation:

The building blocks of the deoxyribonucleic acid (DNA) are nucleotides, while amino acids are the building blocks of proteins. Each nucleotide consists of one of four possible nitrogenous bases: two purines (i.e., adenine and guanine) and two pyrimidines (i.e., cytosine and thymine). In DNA, each nucleotide consists of one of these four nitrogenous bases, a five-carbon sugar molecule (called deoxyribose), and a phosphate group. The DNA molecule has a double-helix structure, where nitrogenous bases are inside the double helix while sugars and phosphates are outside. In DNA, cytosine always pairs with guanine and thymine always pairs with adenine.

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