14. if 30% of a dna sample is made up of thymine, t, what percentage of the sample is made up of
cytosine, c?

20%

Explanation:

Okay so the phrase apples in trees ( Adenine & Thymine ) and cars in garages  (Cytosine & Guanine ) can help in this situation.

Since Thymine is 30%, Adenine will also be 30%. This gives you 60% of the DNA sample.

You have 40% left of the DNA sample so they must be Cytosine and Guanine.

Divide 40% by 2 and you get 20%. So you have 20% Guanine and 20% Cytosine.

Hope it helps!

: )

i dont know the answe

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.