5. Which 3 structures have 2 membranes? (1pt) a. Endoplasmic reticulum, nucleus, mitochondria
b. Chloroplast, golgi apparatus, mitochondria
C. Vacuole, nucleus, ribosomes
d. Nucleus, mitochondria, chloroplast

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme

yes

no

blue is scattered more than other colors because it travels as shorter, smaller waves. this is why we see a blue sky most of the time.

bacterium is not correct

gag reflex, poor dentition, gum retraction

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