The_____is a large, oval structure that directs all of the cell's activites.

Biology

1 answer:

Nonamiya [84]3 years ago

6 0

Answer:

The answer is a nucleus.

Explanation:

The nucleus is a large, oval structure that directs all of the cell's activities.

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If a DNA molecule is found to be composed of 40% thymine, what percentage of guanine would be expected.

Likurg_2 [28]

Answer:

10%

Explanation:

Chargaff postulated the complementary base pairing rule, where he stated that in the DNA molecule, Adenine (A) will always pair with Thymine (T) and Guanine (G) with Cytosine (C) i.e. A-T, G-C

Chargaff stated that the concentration of purines (Adenine and Guanine) is always equal to that of pyrimidines (Thymine and Cytosine) i.e. {A} + {G} = {C} + {T}

These equal concentration equals 100% in totality i.e. A+G+C+T= 100%

Thymine pairs with Adenine, if there is 40% of Thymine in the DNA molecule, it means there will be 40% of Adenine also. 40 + 40 = 80%. This leaves us with 100-80 = 20% for Guanine and Cytosine.

Since there will be an equal amount of Guanine and Cytosine too, Guanine will therefore, be 20/2 = 10%.

That is, 10% Guanine, 10% Cytosine.

8 0

3 years ago

Why are nitrogen oxides considered harmful to humans?

Stolb23 [73]

Answer:

Nitrogen dioxide is an irritant gas, which at high concentration cause inflammation of the airways. ... Nox gases react to form smog and acid rain as well as being central to the formation of fine particles and ground level ozone, both of which are associated with adverse health effects.