<span>A polypeptide is a single linear chain of many amino acids, held together by amide bonds. A protein consists of one or more polypeptides (more than about 50 amino acids long). An oligopeptide consists of only a few amino acids (between two and twenty). </span>
<span />A polypeptide
Cell is the smallest unit of an organism that can have a separate existence.
<h3>What is a cell?</h3>
This question is incomplete but I will try to help you as much as possible. The term cell is the smallest unit of an organism that can have a separate existence.
We know that all cells come from pre existing cells and complex multi-cellular organisms evolved from simple unicellular organisms. This forms the basis of the cell theory.
Learn more about cells: brainly.com/question/5763151
Answer: first photo in my opinion would be d or c, but mostly d!
2nd photo would be either a!
hope i helped!
Water is a negative control