You are handed a model of a protein. It has a three-dimensional shape, and by twisting it, you can see that there is only one polypeptide chain in the model. You can see two alpha helices lined up next to one another in the model. From this evidence, you are looking at what level of protein structure? Tertiary T/F

Answer and Explanation:

1. Amino-acid sequence is the primary structure of a protein

2. Alpha helices, beta sheets and coiled coils refers to the protein folding and they represent the secondary structure of a protein

3. Protein ensemble formed by alpha helices, beta sheets and coiled coils represent the tertiary structure of a protein

4. Macromolecules with multiple polypeptides form globular or fibrous protein structures (quaternary structure)

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

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