Some of the molecules found in animal tissues are grouped into three lists.
1) glucose, cholesterol, triglycerides, water
2) glycogen, antibodies, adenine, phospholipids
3) haemoglobin, carbon dioxide, mRNA, monosaccharides
Which lists include one or more molecules that always contain nitrogen atoms?
1 )
1, 2 and 3
2 )
1 and 2 only
3 )
1 and 3 only
2 and 3 only
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