How do solar thermal generators work? A)
They block high-angle sunlight but allow the penetration of low-angle sunlight.
B)
They use electric pumps to circulate air, water,and other fluids to places where heat is stored and then pumped to where energy is used.
C)
They use flat glass-covered plates over a black background which takes in solar radation and emits heat.
D)
They use solar cells to convert sunlight directly into electricity.
E)
They use sunlight to boil water and run steam-driven systems.

D

Explanation: Best Choice

E.

Explanation:

Solar thermal power/electric generation systems collect and concentrate sunlight to produce the high temperature heat needed to generate electricity. ... The steam is converted into mechanical energy in a turbine, which powers a generator to produce electricity.

BCIP/NBT

Explanation:

BCIP/NBT is a colorogenic substrate used for AP. AP stands for alkaline phosphatase. When they are catalyzed with this alkaline, we would have a product that has a dark blue or probably a purple color. NBT stands for nitro blue tetrazolium. Both of these work as substrate for the reaction. BCIP oxidizes BCIP to form this color.