Materials Science and Protein Structures Quiz

What is one advantage of using PLA rather than LDPE to produce plastic wrapping film?

What is one disadvantage of using PLA rather than LDPE to produce plastic wrapping film?

What is a similarity between α-helix and β-pleated sheets in the secondary structure of proteins?

What is a difference between α-helix and β-pleated sheets in the secondary structure of proteins?

What is the significance of the secondary structures like α-helix and β-pleated sheets in proteins?

What was investigated in the experiment involving different galvanic cells?

Polylactic acid (PLA) and low-density polyethylene (LDPE)

PLA has a higher tensile strength and elongation percentage which makes it stronger and more flexible compared to LDPE.
LDPE's degradation rate is none, whereas PLA's degradation rate is slow, which means LDPE is not biodegradable and can persist in the environment for a long time.

α-helix and β-pleated sheets

α-helix and β-pleated sheets are both secondary structures that provide stability and shape to proteins.
α-helix is a spiral-shaped structure where the polypeptide chain is coiled, while β-pleated sheets are formed by hydrogen bonds between adjacent polypeptide chains.
These structures are significant because they contribute to the overall three-dimensional structure of proteins, determining their function and interactions.

Galvanic Cells Experiment

The experiment measured the potential difference (V) produced by three different galvanic cells.
The cells use different metal electrodes and solutions, creating Electrochemical reactions.
The experiment measured the potential difference, comparing the electro-chemical properties of different metal combinations and solutions.

Test your knowledge on the properties of Polylactic acid (PLA) and low-density polyethylene (LDPE), alongside the characteristics of α-helix and β-pleated sheets in proteins. This quiz also covers the fundamentals of galvanic cells through experimental observations.