The flattened stacks of saclike structures in the chloroplast are called grana,Each sac is known as( ) A: a lumen B: a granum C: a membrane D: a thylakoid E: a photoreactive cente

This organelle is not part of the endomembrane system. It can be found in plants and algae and is responsible for converting solar energy into chemical energy. This organelle is called... A: mitochondria. B: chloroplast. C: lysosome. D: vacuole.

Group I introns are remarkable because: A: They are spliced by external RNA molecules without protein involvement. B: They are spliced by protein molecules in the absence of external RNA molecules. C: They are autocatalytic. D: They are only present in mitochondrial and chloroplast genomes.

The chloroplast<br/>internal membrane is organized into flattened membranous sacs called<br/>_________; they, in turn, are arranged in orderly stacks called<br/>_______ that contain energy-transducing machinery. ( ) A: thylakoids, grana B: grana, thylakoids C: thylakoids, stroma thylakoids D: thylakoids, grana thylakoids