How many membranes surround a chloroplast

Each trait of a plant is determined a. an allele b. one gene c. a pair of genes d. one dominant gene

Does mitochondria still meet the definition of a eukaryote why or why not?

How is ribosomal rna useful as a molecular clock? a. a large portion of the dna ring is not vital to structure or function, allowing it to accumulate neutral mutations. b. its rate of mutation increases over time as organisms continue to evolve and differentiate from each other. c. a slow mutation rate makes it useful for determining evolutionary relationships between ancient species. d. it is only found in select organisms, making it easier to compare relationships between species that have it.