Answer:
The amino sequence of an octapeptide can be determined by :
i.Amino acids present in the peptide
ii.By the behaviour shown by the treatment of these material with different biological and chemical reactions
As shown ammonium was released from the peptide,which shows that the peptide contains either Asn or Gln.
As there is presence of Asp in the amino acid analysis which indicates that the octapeptide contains Asp.
Acid hydrolysis hydrolyzes the peptide bonds which yields a Ala-Val which is the result of partial acid hydrolysis.
Chymotrypsin is on the C-terminal side of the aromatic amino acids Phe, Tyr, and Trp. The peptide has Tyr which indicates that the two present tetrapeptides after chymotrypsin treatment are fourth and eighth amino acids i-e N--Tyr-C and Tyr as the fourth amino acid and Ala-Val somewhere in the octapeptide
As Arg is only present on the C terminal side of the Trypsin cleavage therefore Arg must be the second or the sixth amino acid for the two dipeptides to form as a result of arginine treatment of a tetrapeptide
Cyanogen bromide cleaves on the C-terminal side of Met residues. For free Tyr to be produced from cyanogen bromide treatment of one of the tetrapeptides, Met must be either the third or seventh amino acid. Because Ala was present in both tetrapeptides, Ala must be either the first or fifth amino acid, present in the same tetrapeptide as Arg and Met,i-e N.-Tyr-C and Ala-Val somewhere in the octapeptide and Ala-Arg-Met as the first, second, and third or fifth, sixth, and seventh amino acids and Tyr as the fourth amino acid.
One of the tetrapeptides contains Ala-Val as its second and third amino acids and Asn as its N-terminal amino acid. Therefore two combinations are possible as below
N-Asn-Ala-Val-Tyr-Ala-Arg-Met-Tyr-C or N-Ala-Arg-Met-Tyr-Asn-Ala-Val-Tyr-C
Answer:
The amino aciid sequence of an octapeptide can be determined from the amino acids that are present in the peptide and from the results of different chemical and biological treatments.
One equivalent of ammonium was released fro the peptide, indicating that the peptide contains either Asn or Gln. The presence os Asp in the amino analysis indicates that the octapeptide contains Asn.
A) Acid hydrolysis hydrolyzes peptide bonds. The dipeptide Ala-Val is obtained by partial acid hydrolysis. The indicates that Ala-Val is present in the peptide
B) Chymotrypsin cleaves on the C-terminal side of the aromatic amino acids. Phe, Tyr, and Trp. The peptide contains only Tyr. The presence of tetrapeptides after the treatment of ohymotrypsin indicates that Tyr is the fourth and eighth amino acids.
N-Tyr-C and Tyr present as the fourth amino acid. in constrast, Ala-Val is present in the octapeptide
C) Trpsin cleaves on the C-terminal side of Arg and Lys residues. only Arg is present in the octapeptide. Arg must be the second or sixth amino acid, for two dipeptide to be formed from arginine during the treatment of one tetrapeptide.
D) Cyanogen bromide cleaves on the C-terminal side of Met residues. For free Tyr to be produced from cynogen bromide treatment of one of the tetrapeptides, Met must be either the third or seventh amino acid. Because Ala is present in both tetrapeptides, Ala must be either the first or fifth amino acid, present in the same tetrapeptide as Arg and Met.
In addition, presence of N-...-Tyr-C and Ala-Val in the octapeptide and Ala-Arg-Met as the first, second, third or fifth, sixth or seventh amino acids and Tyr as the fourth amino acid.
E) One of the tetrapides contains Asn as its N-terminal amino acid, and Ala-Val as its second and third amino acids. Two octapeptides are possible from this peptide analysis.
The amino acid sequence of the octapeptide is the following:
N-Asn-Ala-Val-Tyr-Ala-Arg-Met-Tyr-C:
N-Ala-Arg-Met-Tyr-Asn-Ala-Val-Tyr-C:
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Answer:
slope of line a: y=2x-2
slope of line b: y=2x+2
slope of line c: y=1x+2
Explanation:
hope this helps!!
What is the density (g / mL) of a substance that has a mass of 8.11 g and, when placed into a graduated cylinder, causes the water level to rise from 25.26 mL to 44.72 mL?
Answer:
The answer is 0.42 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 8.11 g
volume = final volume of water - initial volume of water
volume = 44.72 - 25.26 = 19.46 mL
We have
[tex]density = \frac{8.11}{19.46} \\ = 0.416752312...[/tex]
We have the final answer as
0.42 g/mLHope this helps you
Cold-winter survival experts do not recommend eating snow for hydration. One reason for this is the energy it takes to increase temperature of the snow, melt it, and then increase the temperature of the resulting water to body temperature. Calculate the total amount of heat to convert 2.000 kg of snow at -15.00 0C to liquid water at 38.00 0C.
POTENTIALLY HELPFUL INFORMATION:
The heat of fusion for water is 1.44 kcal/mol.
The specific heat capacity of solid water is 0.488 cal/g0C.
The specific heat capacity of liquid water is 1.00 cal/g0C.
The freezing point of water is 00C (also known as melting point).
Answer:
The total amount of heat is 250.64 kcal.
Explanation:
Given that,
Total amount of heat = 2.000 kg
Temperature of snow = -15.00°C
Temperature of water = 38.00°C
Heat of fusion of water = 1.44 kcal/mol
Specific heat of solid water = 0.488 cal/g°C
Specific heat of liquid = 1.00 cal/g°C
We need to calculate the heat required to bring temperature -15°C to 0°C snow
Using formula of heat
[tex]Q_{1}=mc_{p}\Delta T[/tex]
Put the value into the formula
[tex]Q_{1}=2000\times0.488\times(0+15)[/tex]
[tex]Q_{1}=14640\ cal[/tex]
[tex]Q_{1}=14.640\ kcal[/tex]
We need to calculate the heat required to convert 0°C snow into 0°C water
Using formula of heat
[tex]Q_{2}=ml[/tex]
Put the value into the formula
[tex]Q_{2}=\dfrac{2000}{18}\times1.44[/tex]
[tex]Q_{2}=160\ kcal[/tex]
We need to calculate heat required to increases temperature of water from 0°C to 38°C
Using formula of heat
[tex]Q_{3}=mc_{p}\Delta T[/tex]
Put the value into the formula
[tex]Q_{3}=2000\times1.00\times(38-0)[/tex]
[tex]Q_{3}=76000\ cal[/tex]
[tex]Q_{3}=76\ kcal[/tex]
We need to calculate the total heat
Using all heat amount
[tex]Q=Q_{1}+Q_{2}+Q_{3}[/tex]
Put the value into the formula
[tex]Q=14.640+160+76[/tex]
[tex]Q=250.64\ kcal[/tex]
Hence, The total amount of heat is 250.64 kcal.
Which unit of size are the smallest organisms found on Earth?
millimeters
picometers
nanometers
micrometers
Answer:
it is nanometers the third one
Explanation:
hope this helps
The correct answer is:
(D) Micrometers
Hope this helps!
Other than lowering the cost of producing coins, what could be another added benefit of changing the metals used to make coins?(hint: think of the density...why would a metal that is less dense be beneficial?)
Answer:
See explanation
Explanation:
A coin is money made from metal stuff. Common coinage metals are copper, silver, nickel etc.
One consideration in coin production is the density of the coin. A coin of less density will have lesser mass and occupy a lesser volume. This makes it easier to carry the coin around.
Coins should therefore be made of low density metals so that they can easily be carried about.
Define molecular mass. Calculate the molecular mass of calcium carbonate
and nitric acid.
Answer:
HNO₃ =63.0147 g/mol
CaCO₃ = 100.088 g/mol
Explanation:
Molecular mass:
It is the sum of all the atomic masses of the atoms of elements present in a molecule.
For example:
The formula of CaCO₃:
Calcium carbonate consist of one atom of calcium, one atom of carbon and three atoms of oxygen. Thus, its molecular mass would be,
CaCO₃ = 40.078 × 1 + 12.01×1 + 16.00×3
CaCO₃ = 40.078 + 12.01+ 48
CaCO₃ = 100.088 g/mol
The formula of HNO₃:
Nitric acid consist of one atom of hydrogen, one atom of nitrogen and three atoms of oxygen. Thus, its molecular mass would be,
HNO₃ =1.008 × 1 + 14.0067 ×1 + 16.00×3
HNO₃ = 1.008 +14.0067 + 48
HNO₃ =63.0147 g/mol
Which of the following shows the abbreviation for an Sl unit of density?
A. L/kg
B. g/mL
C.
g/cm
D. kg/m2
Explanation:
ur answer okkkkkkkkkkkkkkkkll
If I have 21,000 mL of gas at a temperature of 870C and a pressure of 101 atm, what will be the pressure of the gas if I raise the temperature to 1040C and decrease the volume to 15 liters?
Answer:
We have,
Initial volume is V
1
Initial temprature is T
1
=75
0
C
Initial pressure is P
1
So, final temprature is T
2
=273+75=348K
V
2
=V
1
−
100
15
V
1
=
100
85V
1
Applying the gas formula,
T
1
P
1
V
1
=
T
2
P
2
V
2
348
P
1
V
1
=
T
2
×100
2P
1
×85V
1
T
2
=
100
2×85×348
T
2
=591.6K
An ion from a given element has 24 protons and 22 electrons.
What is the charge on the ion? fill in the blank 1
What is the name of the element? fill in the blank 2
What is the symbol for the ion? '
Answer:
Explanation:
The charge on the ion is 24 protons - 22 electrons = 2+
The element is Chromium (number 24 on the periodic table).
Cr^2+
52° 31' 12.0288"N and 13° 24' 17.8344" E.
What continent is it on?
Answer: Europe
Explanation: it’s in germany
*
2. Which of the following is an example of mass?
O A. 7 cm3 of air in a balloon
B. 1 mL of water in a test tube
O C. 4 centimeter piece of string
D. 8 kilograms of bananas
10)
Identify the correct formula for hydrochloric acid.
A)
HCL
B)
HCLO
HCLO4
D)
H2C1
3.7500*10^4+9.7100*5
Answer:
37548.55
Explanation:
3.7500*10^4+9.7100*5
3.7500*10000+9.7100*5
37500+48.55
37548.55
How is volume calculated given mass and density? (4 points)
A. Sum of mass and density
B. Mass divided by density
C. Mass multiplied by density
D. Difference of mass and density
(PLEASE HURRY) Which of the following statements is an example of quantitative data? A. There are ten butterflies. B. The butterflies are red with yellow spots. C. The butterflies are eating nectar from the flower. D. The butterflies are flying.
What are the steps to
separate iron fillings, water,
leaves?
Answer:
Wrap a magnet in plastic lunch wrap and move it through the mixture of the three solids. The iron filings will stick to the magnet. The filings can be removed by unwrapping the plastic from the magnet carefully! Mix the remaining salt and sand in water and stir.
Explanation:
Which answer below correctly identifies the type of change and the explination for the boiling of water
Convert 4.30×10^25 molecules of NH3 to moles please do step by step so I can Understand
Explanation:
Number of molecules: 4.30×10²⁵
We need to find out the total number of moles.
Now, as per Avogadro's law, 6.02×10²³ of anything (Avogadro's number) constitutes a unit called one mole. Just like 12 is a dozen, 6.02×10²³ is a mole.
If you were given 24 bananas and you had to find out the number of dozens, you would divide the total number of bananas (24) by the number of bananas in one dozen (12).
We do exactly the same here: divide the total number of molecules (4.30×10²⁵) by the number of molecules in one mole (6.02×10²³) to get the number of moles.
4.30×10²⁵ / 6.02×10²³ = number of moles
Solving, we get number of NH3 moles = 71.4 which is your final answer!
Hope this helps :D
Round the value 44.981 g to three significant figures.
Answer:
45.0
Explanation:
Using the rules of rounding, we can round 44.981 to 45. We need that third sig fig though, so we add the trailing zero
The value 44.981 g to three significant figures is 45.0 g.
Significant figures, also known as significant digits, are the digits in a number that carries meaning in terms of precision and accuracy. They indicate the certainty or reliability of a measurement or calculated value.
To round the value 44.981 g to three significant figures, follow the rules for significant figures:
Identify the three most significant digits in the number. They are 4, 4, and 9.
Look at the digit immediately after the third significant digit. If it is 5 or greater, round up; if it is less than 5, round down.
In 44.981 g, the digit immediately after the third significant digit (9) is 8. Since 8 is greater than 5, round up.
Therefore, rounding 44.981 g to three significant figures gives us:
45.0 g.
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How many moles are in 1.93x1023 particles of Na3PO4?
Answer:
The answer is 0.32 molesExplanation:
To find the number of moles given the number of entities we use the formula
[tex]n = \frac{N}{L} \\ [/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question
N = 1.93 × 10²³ particles
We have
[tex]n = \frac{1.93 \times {10}^{23} }{6.02 \times {10}^{23 } } \\ = 0.320598006...[/tex]
We have the final answer as
0.32 molesHope this helps you
No. of particles of Na₃PO₄ = 1.93×10²³
We have to find number of moles of the given compound[tex].[/tex]
Number of moles cam be found by using this formula :
[tex]\bigstar\:\boxed{\bf{\purple{n=\dfrac{N}{N_A}}}}[/tex]
n denotes number of molesN denotes number of particles[tex]\sf{N_A}[/tex]denotes avogadro's constantWe know that,
[tex]\bf{N_A}[/tex] = 6.022×10²³★ Calculation :
➠ n = N/[tex]\sf{N_A}[/tex]
➠ n = (1.93×10²³)/(6.022×10²³)
➠ n = 0.32 moles
★ Explore More :
n = weight / Molar massn = volume / 22.4Hope It Helps!What is a hypothesis? O a part of the scientific method that is not necessary a specific and testable question O the variables I observe during the experiment HELP HELP PLS PLS PLS HELP NoW NowWWwWw I'll mark u BRAINLIEST!!!!!!!!
Which of these does not accurately describe the Wright brothers' first
airplane?
A. It had wings that flapped,similar to birds wings
B.it had powerful yet exceptionally lightweight engines
C.it was created after various designs were tested in a wind tunnel
D.it was created using the engineering process
Answer: A
Explanation:
it had wings that flapped, similar to birds' wings.
What’s the difference between Fe and Fe2+?
Fe is the pure element (Iron) while Fe2+ is an isotope of Fe.
Write the complete ionic equation for the reaction that takes place when aqueous solutions of strontium hydroxide and lithium phosphate are mixed.
Answer : The net ionic equation will be,
[tex]3Sr^{2+}(aq)+2PO_4^{3-}(aq)\rightarrow Sr_3(PO_4)_2(s)[/tex]
Explanation :
In the net ionic equations, we are not include the spectator ions in the equations.
Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.
The given balanced ionic equation will be,
[tex]3Sr(OH)_2(aq)+2Li_3PO_4(aq)\rightarrow 6LiOH(aq)+Sr_3(PO_4)_2(s)[/tex]
The ionic equation in separated aqueous solution will be,
[tex]3Sr^{2+}(aq)+6OH^{-}(aq)+6Li^{+}(aq)+2PO_4^{3-}(aq)\rightarrow Sr_3(PO_4)_2(s)+6Li^+(aq)+6OH^{-}(aq)[/tex]
In this equation, [tex]Li^+\text{ and }OH^-[/tex] are the spectator ions.
By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.
The net ionic equation will be,
[tex]3Sr^{2+}(aq)+2PO_4^{3-}(aq)\rightarrow Sr_3(PO_4)_2(s)[/tex]
The complete ionic equation for the reaction between aqueous solutions of strontium hydroxide and lithium phosphate is:
3Sr²⁺(aq) + 6OH¯(aq) + 6Li⁺(aq) + 2PO₄³¯(aq) —> Sr₃(PO₄)₂(s) + 6Li⁺(aq) + 6OH¯(aq)
The complete ionic equation is simply an equation showing all available entities including the spectator ions present in the solution.
With the above information in mind, we shall write the complete ionic equation for reaction between aqueous solutions of strontium hydroxide and lithium phosphate. This can be obtained as follow:
In solution, strontium hydroxide, Sr(OH)₂ and lithium phosphate, Li₃PO₄ will dissociate as follow:
Sr(OH)₂(aq) —> Sr²⁺(aq) + 2OH¯(aq)
Li₃PO₄(aq) —> 3Li⁺(aq) + PO₄³¯(aq)
The reaction will proceed as follow:
Sr(OH)₂(aq) + Li₃PO₄(aq) —>
Sr²⁺(aq) + 2OH¯(aq) + 3Li⁺(aq) + PO₄³¯(aq) —> Sr₃(PO₄)₂(s) + 3Li⁺(aq) + 2OH¯(aq)
Balance the equation by writing 3 before Sr²⁺, 6 before OH¯, 6 before Li⁺ and 2 before PO₄³¯, to obtain the complete ionic equation as shown:
3Sr²⁺(aq) + 6OH¯(aq) + 6Li⁺(aq) + 2PO₄³¯(aq) —> Sr₃(PO₄)₂(s) + 6Li⁺(aq) + 6OH¯(aq)
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Starting from position 3,5 go west 7 , then south 7, then east 4 what’s your ending point?
Answer:
-1, -2
Explanation:
West is left south is down east is right
Plzzzzz help me answer this question (WILL AWARD BRAINLIEST)
what does it mean for electrons to be excited
Answer:
When an electron temporarily occupies an energy state greater than its ground state, it is in an excited state. An electron can become excited if it is given extra energy, such as if it absorbs a photon, or packet of light, or collides with a nearby atom or particle.
Explanation:
Hope this helps.
Have a good night ma´am/sir.
Be safe!
What is the Rutherford experiment?
The Rutherford experiment rose above Thompson's Model 1911 with his gold-foil experiment. He designed an experiment to use the alpha particles created by a radioactive element as probes. Hope this helps you.
What do any two samples of the element mercury (Hg) have in common?
A.the same mass
B.the same volume
C.the same type of atoms
D.the same number of electrons
Answer:
C
Explanation:
The same types of atoms
To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. The correct option is option C.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
In the nucleus of an atom, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron. The two samples of the element mercury (Hg) will have same type of atoms.
Therefore, the correct option is option C.
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When a solid is placed in a container and heat is applied, a phase change occurs. Watch the video and identify which of the following statements are correct.
a) The temperature increases while all of a liquid is converted to a gas.
b) The average kinetic energy of the system changes while all of a solid is converted to a liquid.
c) Temperature remains constant while all of a solid is converted to a liquid.
d) When heat is applied to a solid, the molecular motion decreases as the temperature increases.
e) When a solid is converted to a liquid, heat is absorbed.
Answer:
Temperature remains constant while all of a solid is converted to a liquid.
When a solid is converted to a liquid, heat is absorbed.
Explanation:
During a phase change, the temperature of the system remains constant. Recall that latent heat is defined as heat that causes a change of state without a corresponding rise in temperature of the system.
When a solid is converted to a liquid, latent heat of fusion is involved hence the temperature of the system remains constant throughout the process.
Similarly, heat is absorbed as intermolecular forces are broken up and the would converts to liquid.
