Multiple choice this major site of protein synthesis has ribosomes attached to it and protects proteins within its folds from being exposed to the cell’s internal environment.

a. rough endoplasmic reticulum
b. smooth endoplasmic reticulum
c. golgi apparatus

Its a

Rough endoplasmic rectulum

Or RER.

             Pyruvate is prepared in the cytoplasm (B).

Explanation:
                    Pyruvate is the end product of glycolysis. Glycolysis was discovered by Embden, Meyerhof and Parnas. Hence, it is also called as Embden-Meyerhof pathway (EM pathway).

Steps of Glycolysis:
                                  It occurs in the cytoplasm of cell under aerobic condition. It comprise of two main steps:

1. Preparatory phase:
                                  In this phase glucose is broken down into two molecules of glyceraldehyde 3-phosphate / Dihydroxyacetone phosphate with the help of ATP.

2. Oxidative phase:
                                 Also known as pay off phase. In this phase the oxidative conversion  of glycerladehyde 3-phosphate into pyruvate coupled with formation of ATP and NADH.