Hardness, hope this helps
D is the answer to this question.
I think it’s silicates If you get it wrong just use the app Socratic
Since the
era and reign of science came to be. The products of have been numerous in
results. These four are just of the products of science has offered in the past
centuries.
<span><span>
1. Medicine</span> and pharmacology.
Either you talk about pasteurization or penicillin. Science have given human
kind a chance against these disorders and diseases.</span>
<span><span>2.
</span>Technology.
With science it has also paved humans a new way and new hands of possibilities,
countless.</span>
<span><span>
3.
</span>Transportation.
To remind you that many mechanical engineers and physicists have developed in
the past centuries to what we have now, trains, cars or planes. They maybe just
everywhere now but yesterday it was hard to even be at one place and an hour to
the next. </span>
<span><span>
4.
</span>Electricity.
This is the most important product of science that has delved mankind into the
future. Electricity has been but a vital resource for our everyday life and
even civilization. Especially now.</span>
Answer:
A
Explanation:
Disulfide bridges in proteins are made of covalent bonds between two sulfurs adjacent to each other in a protein. Therefore Cysteines who's side groups have sulfurs are significant determining the position and number of S=S bonds in a protein. Because covalent bonds are the strongest bonds, they stabilize a protein making it is hard to denature. The more the S=S bonds the higher the stability of the protein. An example of proteins with S=S bonds is keratin, the protein that makes nails and curly hair.
