Thylakoids are:

infoldings of the bacterial plasma membrane on which the enzymes of aerobic respiration are located

not found in photosynthetic bacteria

infoldings of the bacterial plasma membrane on which the enzymes of photosynthesis are located

structures only found in eukaryotic chloroplasts

When does a spring tide occur? question 9 options: they occur when the sun, moon, and earth are aligned. in spite of their name, these tides occur twice a year in the spring and fall. they occur on the date of the vernal equinox each year, no matter what stage the moon is in. this is why they are called spring tides. they occur when the sun, moon, and earth are at 45-degree angles from each other. this happens once every spring. they occur when the sun, moon, and earth are aligned. in spite of their name, these tides occur all year long.