A protein made up of 125 amino acids contains an isoleucine residue at position 54 in its polypeptide chain. which amino acid could be substituted for this isoleucine and be expected to cause the least disruption in the protein's three-dimensional structure?

Answers

Answer 1

Answer: To minimize disruption to a protein’s three-dimensional structure when substituting an amino acid, you typically look for amino acids with similar properties. In this case, you have isoleucine (I) at position 54, which is an aliphatic, nonpolar amino acid. Amino acids with similar properties to isoleucine in terms of aliphatic and nonpolar characteristics include leucine (L) and valine (V).

So, substituting isoleucine at position 54 with leucine or valine would be expected to cause the least disruption in the protein’s three-dimensional structure because they share similar properties. These substitutions involve changing one aliphatic, nonpolar amino acid with another, which is less likely to significantly affect the protein’s overall structure and function.

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Which is the most important factor in determining the state of a substance?

Answers

Out of the following given choices;

A. the size of the atoms in a substance

B. the number of molecules in a substance

C. the position of the electrons on the outer valence shells

D. the balance between intermolecular forces and kinetic energy

The answer is D. The kinetic energy of the molecules is determines by the temperatures of the substance. The higher the temperatures, the higher the kinetic energy of the molecules. The molecules subsequently move and collide with higher energies and overcome intermolecular forces. This allows the substance to changes state from solid to liquid and eventually to gas (with increasing kinetic energy).

The most important state in determining the state of a substance is temperature. This is because the kinetic energy of a substance's molecules depend on its temperature. For example, an increase in temperature speeds up the movement of molecules. A decrease in temperature slows down the movement of molecules.

This is important because by increasing or decreasing a substance's temperature, you are also adding or removing energy from it. And when a substantial amount of energy has been added or removed, a substance can change its state from solid > liquid > gas or the other way around.

if measurements of a gas are 75l and 300 kilopascals and then the gas is measured a second Time and found to be 50L describe what had to happen to the pressure

Answers

In this problem, the ideal gas equation PV=nRT is applied. In this relationship, volume is inversely proportional to pressure. Hence, pressure increases when volume decreases, vice versa. In this case, volume is decreased from 75 to 50 L, so the pressure is expected to increase above 300 kilopascals.

Solve for y. -3/y+6=2

Answers

Answer: -7.5

Explanation: To solve for y in the equation -3/(y + 6) = 2, you can follow these steps:

First, we want to get rid of the fraction. To do that, multiply both sides of the equation by (y + 6) to cancel out the denominator:

-3/(y + 6) * (y + 6) = 2 * (y + 6)

This simplifies to:

-3 = 2(y + 6)

Now, distribute 2 on the right side of the equation:

-3 = 2y + 12

Next, isolate the term with 'y' by subtracting 12 from both sides of the equation:

-3 - 12 = 2y

-15 = 2y

Finally, divide both sides by 2 to solve for 'y':

-15/2 = y

So, the solution for y is:

y = -15/2

You can also express this as a mixed number:

y = -7.5

1. Use the chemical equation of Photosynthesis to answer the following prompts.Answer in complete sentences.
6CO2 + 6H2O --> C6H12O6 +602
1. Identify evidence that a chemical reaction has occurred.
2. What element is the most abundant in this chemical reaction?
3. Identify the number of protons, neutrons, and electrons found in the most
abundant element.
4. Identify where we would find the protons, neutrons, and electrons in the
atom of this element.
5. Identify the group and period of the element on the Periodic Table.
swer

Answers

Answer:

1. The evidence that chemical reaction has occurred can be found in the change of the reagents present after the reaction, that is formation of glucose in the area where the reaction is taking place

2. The most abundant element of the chemical reaction is oxygen which has a total quantity of 18 atoms in the reaction

3. The oxygen atom has an atomic number of 8 and therefore contains 8 protons and 8 neutrons and (therefore) 8 electrons (to be neutral, electronically)

4. The protons and the neutrons of the atom, oxygen, are located in the nucleus, while the electron are found in the different orbitals surrounding the atom

5. The element, oxygen, symbol, O, belongs to the group 16 of period 2 in the periodic table

Explanation:

According to the following balanced equation, 2 formula units of Iron (III) Oxide (Fe2O3) can be formed by reacting 4 atoms of iron (Fe) with 3 molecules of oxygen gas (O2). If 12 atoms of iron are reacted with 6 molecules of oxygen gas, which is the limiting reactant and how many atoms or molecules will be left over? 4Fe + 3O2 -> 2Fe2O3

Answers

Answer: The limiting reagent is Oxygen molecule and 4 atoms of Iron will be left over.

Explanation:

The given chemical equation is:

$4Fe(s)+3O_2(g)\rightarrow 2Fe_2O_3(s)$

By Stoichiometry of the reaction:

3 molecules of oxygen gas reacts with 4 atoms of iron.

So, 6 molecules of oxygen gas will react with = $(4)/(3)* 6=8$ atoms of iron.

As, the required atoms of iron is less than the given atoms of iron. Therefore, it is present in excess and is considered as an excess reagent.

Hence, the limiting reagent is Iron atom because it limits the formation of product.

Atoms left remaining at the end of the reaction will be = 12 - 8 = 4 atoms.

Thus, the limiting reagent is Oxygen molecule and 4 atoms of Iron will be left over.

you have to use Avogadro's number (6.02x10^23 molecules/mole) to find the number of moles each reactant starts off with.
moles of Fe and O₂:
12 atoms/(6.02x10^23 atoms/mole)=1.99x10^-23 mol Fe
6 molecules/(6.02x10^23 molecules/mole)=9.967x10^-24 mol O₂
Then you find the limiting reagent by finding how much product each given amount of reactant can make. Which ever one produces the least amount of product is the limiting reagent.
amount of Fe₂O₃ produced:
(1.99x10^-23 mol Fe)x(2mol/4mol)= 9.967x10^-24mol Fe₂O₃
(9.967x10^-24 mol O₂)x(2mol/3mol)= 6.645x10^-24 mol Fe₂O₃
since oxygen produces the leas amount of product, oxygen is the limiting reagent. since we know that oxygen is the limiting reagent we can use the amount of product formed with oxygen to find the amount of iron used.
6.645x10^-24 mol Fe₂O₃x(4mol/2mol)=1.329x10^-23 mol Fe consumed
find the amount left over by subtracting the original amount of Fe by the amount consumed in the reaction.
1.993x10^-23-1.329x10^-23= 6.645x10^-23mol Fe left
find the number of atoms by multiplying that by Avogadro's number.
(6.645x10^-23mol)x(6.02x10^23 atoms/mol)=4 atoms
therefore 4 atoms of Fe will be left over after the reaction happens.

I hope this helps.

Is NH3 a molecular crystal, metal, ionic crystal, or a network solid?

Answers

Hi! NH3 is ammonia and it is a gas. It is a polar molecular solid and it can exhibit hydrogen bonding.

Answer:

Molecular Crystal

Explanation:

Hope this helps!

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According to the collision theory and the model created to explain the collision theory, why does a catalyst cause a reaction to speed up?It lowers the required activation energy. It increases the collisions per minute. It increases the average kinetic energy of the particles. It increases the kinetic energy and the collisions per minute.

which of the following is not a safety tip for using household chemicals? a. read the label before use. b. open a fan or window when using chemicals. c. mix household products together. d. wear protective clothing.

Which one of the following groups of chemical compounds is composed entirely of organic compounds?A. C2H4O, CH2O, CaSO4, C3H5(OH)3B. C2H2, CH4, CaCl2, CaCN2C. Ch3OCH3, Ca3(PO4)2, CO2, H2CO3D. C6H6, C2H5OH, C6H5CH3, C3H5(NO3)3