Once <u>hydrogen</u> bonds form between every fourth amino acid in a polypeptide chain, the chain begins to twist into the <u>secondary</u> structure known as a(n) <u>alpha helix</u>.
<h3>
What is Amino Acid ? </h3>
Amino acids are organic compound. Amino acids contains amine and carboxyl functional group. Amino acids is the building block of life these are the molecules that combine to form proteins.
<h3>What is Polypeptide Chain ? </h3>
A unique sequence of amino acids joined by peptide bonds is called polypeptide.
Thus from the above conclusion we can say that Once <u>hydrogen</u> bonds form between every fourth amino acid in a polypeptide chain, the chain begins to twist into the <u>secondary</u> structure known as a(n) <u>alpha helix</u>.
Learn more about the Amino acids here: brainly.com/question/2526971
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B chemical properties is a right answer
<span>This question is simple, answers are D and C respectively</span>
Destructive interference in which waves cancel each other out is depicted in region X,Y and Z.
<u>Explanation:</u>
Interface is the particle property of light waves. When incident light beam is made to pass through holes, the waves will combine either constructively or destructively. Constructive interference means the waves having same phase will get added so they will increase in amplitude. While destructive interference means the waves combining have different phases like crests and troughs. So they undergo decrease or complete vanishing of amplitude.
When waves combine in constructive interference, they form bright white light and when they combine in destructive interference, they form dark black light. So the regions X, Y and Z are shown as dark black colors in the diagram, so these regions represent destructive interference in which waves cancel each other out.
Answer:
The change that took place is a chemical change as a chemical reaction occurs.
Vinegar = 
Baking soda = 
Reaction:
