The options for this question are not provided hence, I found the answer on the internet.
Phrase to describe the electron transport chain in photosynthesis is:
IT IS A SERIES OF PROTEINS LOCATED IN THE THYLAKOID MEMBRANE OF THE CHLOROPLAST.
ATP synthase enzyme that facilitates electron transport chain in eukaryotic cells. It is present in the inner membrane of mitochondria and in the thylakoid of chloroplast.
Frequently changing their surface proteins
The answer for the above question is Valvular prolapse. It is the normal protrusion of the heart valve, that results in the inability of the valve to close completely. The valve function to prevent the back flow of blood, in this condition the valves do not close smoothly or evenly, but instead bulge upward into the left atrium. Due to the condition some blood may flow backward through the mitral valve with each heart beat.
