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Phospholipids and proteins regulate the movement of substances through the membrane, thereby allowing the membrane to be selectively permeable. This is important since it allows the c...

Imagine a cell like a rectangle, of which one side has finger-like projections (this side faces the intestinal lumen) called the villi, and the other side is flat - the base membrane of that cell that is....

The first stage of gene expression is DNA transcription. Transcription is the formation of single stranded mRNA from double stranded DNA. During transcription, the enzyme DNA helicase unwinds the double h...

Water is made up of one oxygen and two hydrogen atoms. Oxygen is more electronegative than hydrogen, meaning the electrons in the hydrogen-oxygen bond are slightly more attracted to the oxygen. This makes...

All three of these are carbohydrate polymers, formed from glucose monomers.

Glycogen and starch are both polymers of alpha glucose. These long chains of alpha glucose molecules, joined end-to-end, ...