Across
- 4. A primary lymphoid organ that shrinks after puberty
- 6. Disease caused by a lack of a certain enzyme that is triggered by drinking milk
- 7. The total of all chemical reactions carried out by an organism
- 8. Flattened fluid-filled sacs that are the major site of photosynthesis
Down
- 1. Disease that is spread worldwide
- 2. Part of cellular respiration that is a closed pathway that takes place in the matrix of a mitochondrium
- 3. Proteins that are secreted by infected cells to alert neighbouring cells
- 5. The middle layers of a leaf that consists of photosynthetic cells