Two strands of DNA - are held together by

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Q: 117 (CDS-I/2014)
Two strands of DNA - are held together by

question_subject: 

Science

question_exam: 

CDS-I

stats: 

0,33,37,33,20,6,11

keywords: 

{'dna': [3, 1, 1, 2], 'hydrogen bonds': [0, 0, 0, 1], 'covalent bonds': [0, 0, 0, 2], 'strands': [0, 0, 1, 2], 'electrostatic force': [0, 0, 0, 1], 'forces': [0, 0, 0, 1], 'van der waals': [0, 0, 0, 1]}