Select the true statement.

rna is mostly single-stranded; dna is always double-stranded.
rna and dna usually have identical nitrogenous bases.
several types of dna regulate protein synthesis.

50 points! which of the following is an inference? a burning candle is extinguished when it is covered with a jar. the candle burns longer than expected in a jar that has a plant in it. a plant lives longer than expected in a jar that has a burning candle. there is more oxygen in the jar because there is a plant in it.