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Yanka [14]
3 years ago
7

After comparing DNA, a doctor finds that two different samples are the same. The two individuals from whom the samples came are

_____ twins.
Group of answer choices
fraternal
identical
homozygotic
heterozygotic
Chemistry
2 answers:
svetlana [45]3 years ago
6 0
B identical twins is the answer I believe
stira [4]3 years ago
5 0

Answer:

Identical twins

Explanation:

Identical twins are formed from the same zygote(fused sperm and egg cells) which later separates into two different embryos. This is why they are also referred to as monozygotic twins.

Identical twins are alike in almost everything including DNA and phenotypic features such as appearance. However they have a different fingerprint.

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<span>A. Helium </span>atomic number 2
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By studying a star's spectrum, scientists can work out its chemical make-up and temperature. What instrument do astronomers' use
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Calculate the osmotic pressure associated with 50.0 g of an enzyme of molecular weight 98 g/mol dissolved in water to give 2600
andrew-mc [135]

Answer:

π = 4,882 atm

Explanation:

To calculate the osmotic pressure (π), the <em>Van´t Hoff equation</em> must be used, which is:

π x V = n x R x T

<em>Where: </em>

• π: Osmotic pressure, which is the difference between the levels of the solution and the pure solvent through a semipermeable membrane, which allows the passage of the solvent but not the solute

• V: Volume of the solution, in liters unit

• n: Number of moles of solute

• R: Constant of ideal gases, equal to 0.08206 L.atm / mol.K

• T: Absolute temperature, in Kelvin degrees

With the data you provide you can calculate the osmotic pressure by clearing it from the equation, we would be equal to:

π = (n x R x T) / V

However, all data must first be converted to the corresponding units in order to replace the values ​​in the equation.

<em>Solution volume ⇒ go from mL to L: </em>

1000 mL of solution ____ 1 L

2600 mL of solution _____ X = 2.6 L

Calculation: 2600 mL x 1 L / 1000 mL = 2.6 L

<em>Temperature ⇒ Go from ° C to K </em>

T (K) = t (° C) + 273.15 = 30.0 ° C + 273.15 = 303.15 K

<em>Number of moles of solute ⇒</em> <em>It can be calculated since we have the mass of the enzyme and its molecular mass: </em>

98.0 g of enzyme ____ 1 mol

50.0 g of enzyme _____ X = 0.510 moles

Calculation: 50.0 g x 1 mol / 98.0 g = 0.510 moles

Now, you can replace the values ​​in the Van´t Hoff equation and you will get the result:

 π = (n x R x T) / V

π = (0.510 mol x 0.08206 L.atm / mol.K x 303.15 K) / 2.6 L = 4.882 atm

Therefore, <em>the osmotic pressure will be 4,882 atm</em>

3 0
3 years ago
Is this right?If not what did I do wrong ?
Eddi Din [679]

Hey there,

It seems we do not have an image. Mind supplying us with one?

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An atom has 5 protons and 7 neutrons. What is its mass number?
lisabon 2012 [21]
Mass number = protons + neutrons
mass number = 5 + 7
mass number = 12
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