Question

genes for | cells | white | red (immature)
glycolysis enzymes | on | on | on
muscle proteins | on | off | off
glucagon | off | off | off
hemoglobin | off | off | on
based on the table, which conclusion can be made?
a) the gene that codes for glucagon is active only in muscle cells.
b) the gene that codes for hemoglobin is absent from blood cells.
c) the factors that regulate gene expression for muscle proteins are active in red and white blood cells.
d) the factors that regulate gene expression for glycolysis enzymes are active in muscle and blood cells.

Explanation:

• Option A: The glucagon gene is "Off" in muscle cells (and other cells here), so it's not active only in muscle cells. Eliminate A.
• Option B: Hemoglobin gene is "On" in immature red blood cells (a type of blood cell), so it's not absent from blood cells. Eliminate B.
• Option C: Muscle proteins gene is "Off" in red and white blood cells, so the regulatory factors for it are not active there. Eliminate C.
• Option D: Glycolysis enzymes gene is "On" in muscle cells (implied by "Cells" column, likely muscle cells) and both white and red (immature) blood cells, meaning the regulatory factors for it are active in these cells. This matches.

Answer:

D. The factors that regulate gene expression for glycolysis enzymes are active in muscle and blood cells.