Which part of the calvin cycle would be affected if a cell could not produce the enzyme
rubisco)?

The first step also referred to as Carbon Fixation

Explanation:

RuBisCo is an enzyme that catalyzes the attachment of carbon molecule to ribulose phosphate (RuBp) forming the 6-carbon molecule that immediately splits into two 3-carbon molecules of 3-phosphoglycerate (3-PGA).  

metamorphism is the change of minerals or geologic texture (distinct arrangement of minerals) in pre-existing rocks (protoliths), without the protolith melting into liquid magma (a solid-state change). the change occurs primarily due to heat, pressure, and the introduction of chemically active fluids. i hoped i !