Which of the following accurately describes a subcellular organelle that functions in providing energy for the cell?

a. Chloroplasts are divided into an intermembrane space that contains thylakoids and the stroma, which contains chloroplast DNA, enzymes, and ribosomes.
b. Cristae divide mitochondria into the intermembrane space and the mitochondrial matrix, which contains mitochondrial DNA, enzymes, and ribosomes.
c. Nuclei consist of a nucleolus, proteins, and DNA, which interact to synthesize rRNA via transcription and translation.
d. Ribosomes consist of proteins and two rRNA subunits, which are synthesized and joined in the nucleolus.

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