Preheat oven to 350 degrees (F).
Combine flour, baking soda, baking powder, and salt in a medium-sized mixing bowl and set aside.
Combine sugar, zucchini, cooking oil, egg, lemon juice, and lemon zest in a separate bowl and mix together.
Add the dry ingredients to the zucchini mixture and stir until just combined.
Pour batter into a greased loaf pan (9"x5").
Bake at 350 degrees (F) for 45 - 50 minutes or until golden brown.
Cool on a wire rack for 15 minutes, and then remove from pan and cool completely.
Combine ingredients for the glaze and drizzle over the bread. If the bread isn't cool, the glaze will soak into the bread and be even more lemony.
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