Is energy cyclic or one directional

Which macromolecule catalyzes chemical reactions this be considered enzyme chemical reactions thus he considering enzymes

Why do some dna fragments move farther than others during gel electrophoresis? a. because their shapes are different b. because they are different types of molecules c. because the samples are different colors d. because their masses are different

The big bang theory suggest that the universe is about - 300 million years old - 4.6 billion years old - 30 billion years old - 13 billion years old