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4 years ago

In correct order, what are the nitrogen bases in the initiation code for a peptide chain?

Chemistry

1 answer:

Likurg_2 [28]4 years ago

8 0

Answer:

D. thymine, adenine, and cytosine (TAC)

Explanation:

DNA gets synthesised into an mRNA which gets synthesised into a peptide chain and eventually forms a protein.

In order to know where to begin joining up a peptide chain from amino acids, the protein-synthesis machinery searches for a start codon.

This is the three bases AUG, which code for the amino acid methionine.

Since the start codon in an mRNA is AUG, that means in the DNA, the initiation code will be complementary, so it will be TAC.

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A hydrocarbon is burnt completely to give 3.447g of

goblinko [34]

Answer: The empirical formula for the given compound is $CH_2$

Explanation:

The chemical equation for the combustion of compound having carbon, hydrogen, iron and oxygen follows:

$C_xH_y+O_2\rightarrow CO_2+H_2O$

where, 'x' and 'y' are the subscripts of carbon and hydrogen respectively.

We are given:

Mass of $CO_2=3.447g$

Mass of $H_2O=1.647g$

We know that:

Molar mass of carbon dioxide = 44 g/mol

Molar mass of water = 18 g/mol

For calculating the mass of carbon:

In 44g of carbon dioxide, 12 g of carbon is contained.

So, in 3.447 g of carbon dioxide, $\frac{12}{44}\times 3.447=0.940g$ of carbon will be contained.

For calculating the mass of hydrogen:

In 18g of water, 2 g of hydrogen is contained.

So, in 1.647 g of water, $\frac{2}{18}\times 1.647=0.183g$ of hydrogen will be contained.

To formulate the empirical formula, we need to follow some steps:

Step 1: Converting the given masses into moles.

Moles of Carbon = $\frac{\text{Given mass of Carbon}}{\text{Molar mass of Carbon}}=\frac{0.940g}{12g/mole}=0.0783moles$

Moles of Hydrogen = $\frac{\text{Given mass of Hydrogen}}{\text{Molar mass of Hydrogen}}=\frac{0.183g}{1g/mole}=0.183moles$

Step 2: Calculating the mole ratio of the given elements.

For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 0.0783 moles.

For Carbon = $\frac{0.0783}{0.0783}=1$

For Hydrogen = $\frac{0.183}{0.0783}=2.34\approx 2$

Step 3: Taking the mole ratio as their subscripts.

The ratio of C : H = 1 : 2

Hence, the empirical formula for the given compound is $CH_2$

8 0

4 years ago

What mass of aluminum (in g) would be

antiseptic1488 [7]

Mass of Aluminum (in g) : 4.104

<h3>Further explanation</h3>

Reaction

2 Al(s) + 6 HCl(aq) → 2 AICI₃ (aq) + 3 H₂(g)

mol HCl :

$\tt 1.3\times 0.35=0.455$

mol Al :

$\tt \dfrac{2}{6}\times 0.455=0.152$

mass of Aluminum :

$\tt 0.152\times 27~g/mol=4.104~g$

5 0

3 years ago

A reaction between 46 grams of sodium and 71 grams of chlorine formed table salt and heat.

vazorg [7]

Answer:

d. 117 grams

Explanation:

The mass of the table salt produced will be 117 grams.

Chemical reactions obey the law of conservation of mass. In this regard, matter is neither created nor destroyed in the course of a chemical reaction. It is expected that the mass of the reactants and products remain the same.

The reaction expression:

2Na + Cl₂ → 2NaCl

So, mass of sodium = 46g

mass of chlorine formed = 71g

Mass of NaCl = 46 + 71 = 117g

7 0

3 years ago

What procedure allows use to determine the pH of an unknown solution

pishuonlain [190]

It is Titration (when you adding ,for example, acid to base)

3 0

3 years ago

7. Which of the following is most likely to produce an ionic bond? *

Mrac [35]

Answer:

AL and F

Explanation:

ionic bonds occur through a metal and a non metal

5 0

3 years ago