It's quite nice!
| Front | The Feynman/ U2 - Secondary active transport |
| Back | Secondary active transport is the movement of molecules from a lower concentration to a higher concentration, through an energy source that is not caused by ATP. Instead, it is caused due to a secondary energy source. The proteins that participate in secondary active transport are symporters and antiporters. |
| Front | The Feynman/ U1 - The smooth endoplasmic reticulum (SER) |
| Back | The SER is the smoother part of the endoplasmic reticulum. It is certainly not separated from the RER. For example, the RNA that is transcribed in the RER exits out a continuous tubule that does not cut off, which is considered SER, known as the transitional endoplasmic reticulum. The SER is known for secreting lipids. |
| Front | The Feynman/ U1 - The periodic elements of life |
| Back | Many common elements that are seen in the outside world are also very common to biological structures. The most common elements that form biological molecules are oxygen, carbon, hydrogen, nitrogen, sulfur, and phosphate. |