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yan [13]
3 years ago
13

1.

Chemistry
1 answer:
77julia77 [94]3 years ago
8 0

Answer:

1. The bases are on the <u>interior</u> of the double helix.

2.  They are arranged<u> neatly stacked</u>.

3.  The phosphate groups are on the <u>exterior</u> of the DNA molecule.

4.  The sugar groups on the <u>exterior</u> of the DNA molecule.

Explanation:

DNA is made up of basic chemical components called nucleotides. These basic components include a phosphate group, a sugar group and one of four types of alternative nitrogenous bases. To form a strand of DNA, the nucleotides unite to form chains, alternating with the phosphate and sugar groups.  

The four types of nitrogenous bases found in nucleotides are: adenine (A), thymine (T), guanine (G), and cytosine (C). The order, or sequence, of these bases determines which biological instructions are contained in a strand of DNA, being within the strands already mentioned.

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Given that the density of TlCl(s) is 7.00 g/cm3 and that the length of an edge of a unit cell is 385 pm, determine how many form
ryzh [129]
Here's my best guess
the volume of the unit cell is (385*10^-12)^3=5.7066*10^-29 m^3
multiply by density to get mass mass = (7 g/cm^3)*(100^3 cm^3 / 1^3 m^3) * 5.7066*10^-29 m^3= 3.99466*10^-22 g
covert to moles 3.99466*10^-22 g * 1 mol / 239.82 g = 1.6657 *10^-24 mol
convert to number of units

1.6657 *10^-24 mol * 6.23*10^23 units/mol = 1.04

385 pm = 3.85*10^(-8) cm

The volume of the unit cell is the cube of that, which is 5.71*10^(-23) cm^3. Since the ratio of mass to volume (i.e. the density) must be the same no matter what amount of TlCl you have, you can say:
7 = x/(5.71*10^(-23)), where x is the mass of the unit cell. Solving for x, you get 4*10^(-22) g.

The mass of a molecule of TlCl is 240 amu, which in grams is 4*10^(-22) g. The mass of the unit cell and the mass of a molecule of TlCl is the same. Therefore there is one formula unit of TlCl per unit cell.

3 0
3 years ago
What is the valence electron of manganese?​
DIA [1.3K]

Answer:

25th electron

Explanation:

the last electron is the valence electron. Assuming it has equal numbers of protons and electrons, then the 25th electron is the valence.

6 0
3 years ago
Read 2 more answers
What has less energy than visible light in the electromagnetic spectrum?
QveST [7]
Infrared waves, micro waves, radio waves because they are weaker.
3 0
3 years ago
Assume we have 25 mL of a 2.5 M HCl and a solution of NaOH of unkown concentration. The two react via the following equation.
navik [9.2K]

Answer is  A - HCl is the titrant and D-NaOH is the analyte.

In a titration process, the solution of unknown concentration considered is the analyte. During titration, a standard solution(titrant) is added to an analyte until the equivalence point is achieved.

So in this case as the concentration of NaOH is not known,NaOH is the analyte.

Titrant is the solution whose concentration  is known to us and is added to an analyte until the equivalence point is reached. In this case since we know the concentration of HCl, HCl is the titrant.


6 0
4 years ago
Which of the following increases as the concentration of a colored solution increases? wavelenght transmittance absorbance b) A
iris [78.8K]

Answer:

a) Absorbance

b) The absorb light most strongly in 580nm

Explanation:

Beer-Lambert law relates concentration with light absorbance. The more concentrated solution are the more molecules and the most absorbance.

Wavelenght depends of composition of solution and doesn't change with different concentrations of the same solution.

Transmittance is inversely proportional to absorbance. Thus, the more concentrated solution the less transmittance.

Colored compounds are absorb energy of visible radiation. The colour that we see is a  result of the absortion of complimentary colour (Colour wheel). Thus, a blue-green solution absorb energy of ≈600 nm. Thus, the absorb light most strongly in 580nm.

I hope it helps!

6 0
4 years ago
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