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sesenic [268]
4 years ago
6

There are 81 amino acid residues in the precursor molecule of bovine insulin. What is the least number of bases that must be in

the DNA chain that codes for this molecule?
Chemistry
2 answers:
Usimov [2.4K]4 years ago
8 0
If you count the methionine expressed for the start codon as part of the precursor protein, then (81+1)*3. (The start codon is expressed, but the stop codon isn't.) 
Andreyy894 years ago
5 0

Answer:

246 amino bases

Explanation:

An amino acid is coded by three bases. However, in a DNA molecule, there is coding that takes place. In DNA replication, the start and stop codons are not expressed during the formation of the double helix. Hence, an extra amino acid will be needed. In fact, this can be expressed mathematically like this:

Number of bases = (n+1) * 3

where n is the number of amino acid residues. Therefore, taking 81 amino acid residues yields:

                 N = (81+ 1) * 3\\246

Therefore, the least number of bases needed will be 246

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As a maritime air mass moves across land, what happens to the air mass?
jasenka [17]

Answer:

the air mass will become colder

Explanation:

A maritime tropical air mass is moist and warm, while a continental polar air mass is dry and cold. ... When an air mass moves to a new region, it carries along its characteristic moisture and temperature. As the air moves over Earth's surface, the characteristics of the surface begin to change the air mass.

6 0
3 years ago
A student places four identical cells into four different liquids. Over time which cell will look the smallest WXY or Z
marta [7]

Answer: W

Explanation:

The cell in liquid W will look the smallest out of the four because of Osmosis.

Osmosis is a process by which water molecules move from an area of relatively higher concentration of water to an area with a relatively lower concentration through a selectively permeable membrane(cell membrane).

With W being saltier than the cell, water molecules will move from the cell to liquid W to balance the concentrations inside and outside the cell which will lead to the cell in W being smaller.

3 0
3 years ago
MgSO4(aq) + 2NaOH(aq) Mg(OH)2(s) + Na2SO4(aq) i. Write the complete ionic equation from the balanced equation. (3 points) Please
Igoryamba

Answer:

Mg²⁺(aq) + SO₄²⁻(aq) + 2Na⁺(aq) + 2OH⁻(aq) → Mg²⁺(aq) + 2OH⁻(s) + 2Na⁺(aq) + SO₄²⁻(aq)

Explanation:

The complete ionic equation is the chemical equation where the chemical species in the aqueous phase (aq) are written as ions.

In the reaction:

MgSO₄(aq) + 2NaOH(aq) → Mg(OH)₂(s) + Na₂SO₄(aq)

MgSO₄ dissociates in Mg²⁺ and SO₄²⁻, NaOH in Na⁺ and OH⁻, Mg(OH)₂ doesn't dissociate because is as solid and NaSO₄ dissociates in Na⁺ and SO₄²⁻ ions.

That means the complete ionic equation is:

<h3>Mg²⁺(aq) + SO₄²⁻(aq) + 2Na⁺(aq) + 2OH⁻(aq) → Mg²⁺(aq) + 2OH⁻(s) + 2Na⁺(aq) + SO₄²⁻(aq)</h3>

4 0
3 years ago
6 moles of H2O is equal to how many molecules?
alexandr1967 [171]
6 miles of H2O is equal to 12 Hydrogen molecules and 6 oxygen molecules. Equaling 18 in total.
5 0
3 years ago
Why does mantle rock begin to sink back towards the lower mantle from the area closest to the crust?
Delvig [45]

Answer: Convection Currents

Explanation: The mantle rock is solid and denser because it is cooler. This means it will sink closer to lower mantle as warmer, lense dense rock/magma moves upwards.

8 0
3 years ago
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