Which of the following is true of dna only?
only dna can be read by trna molecules during replication.
only dna contains adenine, guanine, and cytosine in a sequence.
only dna has a single stranded structure.
only dna serves as the master copy of an organism's genetic code.

The steps in the formation of extrusive igneous rocks are listed below in an incorrect order: 1. rock melts due to high temperature. 2. rock is buried deep under earth's surface. 3. magma is forced out of earth's surface during volcanic eruption. 4. lava cools and crystallizes to igneous rock. which of these best shows the correct order of steps in the formation of extrusive igneous rocks? 1, 3, 4, 2 2, 1, 3, 4 3, 4, 2, 1 4, 2, 1, 3