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3 years ago

True or false according to the principle of base pairing hydrogen bonds could form only between adenine and cytosine

1 answer:

8 0

Answer is: false.
According to the principle of base pairing hydrogen bonds could form between adenine and thymine (two hydrogen bonds between this nucleobases) and guanine and cytosine (three hydrogen bonds between this nucleobases).
Adenine and guanine are purine derivatives and thymine and cytosine are pyrimidine derivates.

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3 years ago

Milk has a density of 1.04 g/ml. If you have a volume of 510 ml, what is the mass in grams

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Density is defined as the ratio of mass and volume. The formula of density is:

$density = \frac{mass}{volume}$ -(1)

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Volume of milk = $510 mL$ (given)

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$1.04 g/mL = \frac{mass}{510 mL}$

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3 years ago

Assuming an ionization efficiency of 13.0%, how many such photons are needed to ionize 1.00×1016 atoms?

sammy [17]

Answer:

7.69x $10^{16}$

Explanation:

The ionization is the energy necessary to transform an atom in an anion. So, it's the energy it requires to gain an electron.

This ionization occurs for the photoelectric effect - the emission of electrons by metal using photons. So, if the efficiency is 100%, 1 photon can ionize 1 atom, but for an effficiency of 13.0%:

N = $\frac{1.00x10^{16}}{0.13}$

N = 7.69x $10^{16}$

Where N is the number of photons.

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3 years ago