Final answer:
The enzyme that links glycolysis in muscle cells and gluconeogenesis is Glucose-6-phosphatase. It is responsible for the dephosphorylation of glucose-6-phosphate to free glucose in the final steps of gluconeogenesis.
Step-by-step explanation:
The link between glycolysis in muscle cells and gluconeogenesis is a process involving various enzymes, where pyruvate produced during glycolysis can either enter the citric acid cycle or be used as a substrate for gluconeogenesis. However, the question seems to be asking which enzyme is specifically responsible for linking these two pathways. In this context, the correct answer is Glucose-6-phosphatase (B), an enzyme that is crucial for the final steps of gluconeogenesis, where glucose-6-phosphate is dephosphorylated to free glucose, which can then be released into the bloodstream. While other enzymes like pyruvate kinase and hexokinase play significant roles in the regulation and initiation of glycolysis, respectively, they are not the specific link between glycolysis and gluconeogenesis.