What charge does a dna molecule have?
DNA does contain in its backbone phosphates. These are negatively charged. This negative charge is responsible for the whole DNA molecule to appear negatively charged as a mild acid. So it is called* a nucleic ACID, a "DNacid".
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How do baby birds get oxygen inside their eggs?
They have a large oxygen supply from the start
Oxygen is created during protein reduction
Oxygen comes in through pores in the shell
They don't need oxygen at all
How deep is the root system of a giant sequoia?
4 meters (13 feet)
20 meters (60 feet)
40 meters (130 feet)
80 meters (260 feet)