This dipeptide is designated as: there is a structure for h3nchcnhchco with ch2oh group attached to the first (from left to righ
t) carbon, two oxygen atoms attached to the second and fourth carbons by double bonds, and ch2sh group attached to the third carbon. nitrogen has a charge of 1 plus. oxygen atom, which is attached to the fourth carbon by a single bond, has a charge of 1 minus.
1 answer:
A dipeptide is formed when 2 amino acids are joined together by a peptide linkage.
Each amino acid molecule contains an amino group ( -NH₂) and a carboxyl ( -COOH) group. During peptide formation, a carboxyl group of one amino acid reacts with amino group of the other , resulting in the formation of a linkage known as "peptide linkage". A water molecule is also eliminated in this reaction.
A general peptide formation reaction can be written as
In the above reaction, we can see a peptide linkage ( -CONH-) getting formed between 2 amino acid molecules.
In the given molecule the peptide linkage is shown by drawing a box around it. Please refer to the attached image.
If we want to know the amino acid molecules from which this peptide is formed, we will simply break the CO-NH bond.
We will add -OH group to CO part and -H to NH part to get 2 amino acid molecules as shown in the picture.
The two amino acids thus formed are Serine & Cysteine.
Serine is designated as "Ser" and Cysteine is designated as "Cys"
Therefore the given dipeptide is designated as "Ser-Cys"
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Answer:
Explanation:
We are asked to find how many molecules are in 3.6 grams of sodium chloride.
<h3>1. Convert Grams to Moles </h3>First, we convert grams to moles using the molar mass. These values are equivalent to atomic masses on the Periodic Table, but the units are grams per moles instead of atomic mass units. Look up the molar masses of the individual elements: sodium and chlorine.
- Na: 22.9897693 g/mol
- Cl: 35.45 g/mol
There are no subscripts in the chemical formula (NaCl), so we simply add the 2 molar masses.
- NaCl: 22.9897693 + 35.45 = 58.4397693 g/mol
Now we will convert using dimensional analysis. First, set up a ratio using the molar mass.
We are converting 3.6 grams to moles, so we must multiply the ratio by this value.
Flip the ratio so the units of grams of sodium chloride cancel.
Next, we convert moles to molecules using Avogadro's Number. This is 6.022 × 10²³ and it tells us the number of particles (atoms, molecules, formula units, etc). In this case, the particles are molecules of sodium chloride. Let's set up another ratio.
Multiply by the number of moles we calculated.
The units of moles of sodium chloride cancel.
The original measurement of grams (3.6) has 2 significant figures, so our answer must have the same. For the number we found, that is the tenths place. The 0 in the hundredth place tells us to leave the 7 in the tenth place.
There are in 3.6 grams and the correct answer is choice D.