The ETC in photosynthesis happens in the _______, while the ETC in cellular respiration happens in the ______.
1 point
thylakoid membrane; cristae
thylakoid membrane; cell membrane
thylakoid membrane; matrix
mitochondrial membrane; cell membrane
thylakoid membrane; mitochondrial membrane
The ETC (Electron Transport Chain) in photosynthesis happens in the thylakoid membrane, while the ETC in cellular respiration happens in the mitochondrial membrane.
To determine the correct answer, we need to understand the processes of photosynthesis and cellular respiration.
Photosynthesis occurs in the chloroplasts of plant cells. During photosynthesis, light energy is converted into chemical energy in the form of glucose. One of the important steps in photosynthesis is the Electron Transport Chain (ETC), which takes place in the thylakoid membrane of the chloroplasts. In this process, electrons are transferred along a series of proteins, creating a proton gradient, which is used to generate ATP (Adenosine Triphosphate) and NADPH (Nicotinamide Adenine Dinucleotide Phosphate).
On the other hand, cellular respiration occurs in the mitochondria of both plant and animal cells. This process involves breaking down glucose to produce energy (ATP) that is used by cells. Similar to photosynthesis, cellular respiration also involves an Electron Transport Chain (ETC). However, in cellular respiration, the ETC takes place in the inner mitochondrial membrane, which is also known as the cristae. Here, electrons from NADH (a molecule carrying high-energy electrons) are transferred along a series of proteins, creating a proton gradient that drives ATP synthesis.
Based on this information, the correct answer is:
ETC in photosynthesis happens in the thylakoid membrane, while the ETC in cellular respiration happens in the mitochondrial membrane (cristae).