Colloid is the mixture of red blood cells that is floting with plasma. This is in the body.
The correct answer is polypeptide. There is a hypothesis about this question and it states that the actual function of genes in all species is to control the synthesis of polypeptides who then affect a metabolic pathway. This hypothesis was established in 1941 by the scientists George Beadle and Edward Tatum, after studying mutations of Neurospora Crassa. The research was continued by Norman Horowitz and it is considered to be the base of molecular genetics.
The plasma membrane is the membrane that surrounds cells and controls what comes in and what goes out of that cell. It is made up of layers of phospholipids whos tails are nonpolar (no charge) and the heads of the Phospholipids are Polar (have a charge).
False results, wrong observations, etc, etc..
If your options are these:
a graduated cylinder
a beaker
a digital scale
a ruler
I would say a graduated cylinder.