Which of the following human digestive enzymes is secreted in an inactive form and is activated by the enzyme enterokinase? MCQ with Answer and Explanation

Explanation:
During metaphase, chromosomes are maximally condensed and align at the cell equator (metaphase plate) attached to spindle fibers via kinetochores. This alignment ensures equal segregation. In prophase, chromosomes condense; anaphase, sister chromatids separate; telophase, nuclear envelope reforms. Metaphase is the best stage for studying chromosome morphology for karyotyping.

Explanation:
Carbon dioxide (CO₂) is the primary greenhouse gas, along with methane (CH₄), nitrous oxide (N₂O), water vapor, and CFCs. These trap heat in the atmosphere, leading to global warming and climate change. CO₂ levels have risen due to fossil fuel burning and deforestation. The greenhouse effect is natural and essential, but enhanced levels cause global temperature rise.

Explanation:
Pyruvate dehydrogenase complex (PDC) oxidatively decarboxylates pyruvate, producing acetyl-CoA, NADH, and CO₂ in the mitochondrial matrix, linking glycolysis to the Krebs cycle. Pyruvate kinase is in glycolysis, lactate dehydrogenase converts pyruvate to lactate, citrate synthase starts the Krebs cycle.