Where does glycolysis take place in eukaryotic cells?
a. In the cytoplasm
b. Within mitochondria
c. On rougher ER
d. Within grana

Hint: The food is transformed into the usable form of energy by most of the organisms through the process of cellular respiration. Glycolysis is the primary step of cellular respiration which transforms the molecules of glucose into the pyruvate.

Complete answer:
Glycolysis is the metabolic pathway that helps in breaking down glucose molecules for extraction of energy. In both the prokaryotic as well as eukaryotic cells, the process of glycolysis takes place in the cytoplasm. This process is anaerobic as it does not require oxygen.

Glycolysis is the one of the primary metabolic pathways involved in cellular respiration that results in the formation of ATP which is a form of energy. This process is carried out in two distinct phases via a series of enzymatic reactions, thus cleaving a molecule of glucose (a six-carbon ring molecule) into the pyruvate (a three carbon molecule). Energy consumption takes place in the first phase of glycolysis while in the second phase; formation of pyruvate molecules takes place thereby producing ATP and NADH as a source of energy. After glycolysis, cells undergo Krebs cycle for the production of further ATP molecules to meet the energy requirement of a cell.

On the other hand, Krebs cycle occurs in the mitochondrial matrix of the eukaryotic cells while on rough ER, synthesis and export of protein is carried out. Moreover, granum has their role in the photosynthetic reactions.

Hence, the correct answer is option (A).

Note: The process of glycolysis is carried out in almost all the living organisms present on earth. In cells, glucose is considered one of the primary sources for generation of energy. Glycolysis results in the production of two pyruvate molecules along with two ATP and 2 NADH molecules.