BIOCHEM 4

Most of the reactions of electron transport in the mitochondria occur:

• on the outer membrane

• on the inner membrane.

• in the mitochondrial matrix.

• in the intermembrane space.

• in the cytosol.

The key element at the center of chlorophyll is:

• chlorine.

• copper.

• iron.

• magnesium.

• manganese.

Which of the following genes in normal cells can be related to oncogenes?

• Cyclins, which regulate the timing of cell division.

• Tumor suppressing proteins.

• Hormone receptors on the surface of the cell.

• Protein kinases, which regulate the activity of cellular proteins.

• Oncogenes include examples of all of these.

The region of the chloroplast between the inner membrane and the thylakoid membrane is called

• the stroma.

• the thylakoid space.

• the intermembrane space.

• the grana.

The ultimate electron acceptor in the electron transport chain is

• NAD

• Oxygen

• FAD

• ADP

Which of the following is not a component of the electron transport chain that links Photosystem I and Photosystem II?

• NADPH

• pheophytin

• plastoquinone

• cytochrome f

Light energy absorbed in chloroplasts is used in the light phase for all of these reactions, except:

• To reduce water.

• To make ATP.

• To generate NADPH.

• To reduce water and to generate oxygen, O2.

• All of these occur during the light phase.

The ability of cancer cells to travel to other parts of the body and produce new tumors is called

• immortality.

• oncogenesis.

• metastasis.

• suppression.

The terminal electron acceptor during the light phase of photosynthesis in green plants is

• Hydrogen (H2 ® H2O).

• NAD+ ( ® NADH).

• NADP+ ( ® NADPH).

• Oxygen (O2 ® H2O).

• Sulfur ( ® H2S).

The only complex which actually uses molecular oxygen is

• Complex I.

• Complex II.

• Complex III.

• Complex IV.

• It is not known where oxygen is used