Why do different proteins get expressed in different types of cells?
Only a fraction of the genes in a cell are expressed at any one time. The variety of gene expression profiles characteristic of different cell types arise because these cells have distinct sets of transcription regulators. Some of these regulators work to increase transcription, whereas others prevent or suppress it.
Why do we have different proteins?
The human body uses just 21 amino acids to make all the proteins it needs to function and grow. Because amino acids can be arranged in many different combinations, it’s possible for your body to make thousands of different kinds of proteins from just the same 21 amino acids.
Which is one function of a protein macromolecule?
Types of biological macromolecules
| Biological macromolecule | Building blocks | Functions |
|---|---|---|
| Proteins | Amino acids | Provide cell structure, send chemical signals, speed up chemical reactions, etc |
| Nucleic acids | Nucleotides | Store and pass on genetic information |
Why do some organisms make one type of protein for a feature and other organisms make two?
Why do some organisms make one type of protein for a feature and others make two? An organism has two copies of a gene for each feature; these can be the same version or different.
Which one of the following is a main function of proteins?
What are proteins and what do they do?
| Function | Description | Example |
|---|---|---|
| Structural component | These proteins provide structure and support for cells. On a larger scale, they also allow the body to move. | Actin |
| Transport/storage | These proteins bind and carry atoms and small molecules within cells and throughout the body. | Ferritin |
What cell structure modifies proteins?
The Golgi apparatus
Figure 1: The Golgi apparatus modifies and sorts proteins for transport throughout the cell. The Golgi apparatus is often found in close proximity to the ER in cells.