How do electrons gain energy in photosystem i? a. they take energy from the atp molecules b. they absorb photons. c. they use energy from a hydrogen ion pump d. they use energy in the form of glucose.

Which of the following does not describe a physical property of iron? a iron is silvery-white or gray in color. b iron has a boiling point of about 3,000°c. c iron is a magnetic element . d iron and sulfur react to form iron sulfide.

Across of blue x blue (both heterozygous) would result in

Pls me i need this ! each cell has genes activated depending on it's job and what kind of cell it is. it is the presence of that causes the repressor protein to fall off and unblock the gene on the lac operon. if a gene is turned on then it is being an additional circular chromosome found in some bacteria that is used in genetic engineering.