Hello!
Standards of mass are necessary because it is a whole lot easier than using a bunch of different systems. Since the metric system is common, it would be easier to compare something with someone from America and someone from Germany using the metric system as opposed to something otherwise.<span />
The answer to your question is,
A) A negatively and positively charged ion.
-Mabel <3
The DNA molecule is composed of two long complementary chains of nucleotides. The complementary DNA sequence of CGTA is GCAT.
The DNA molecule is composed of two antiparallel strands of nucleotides linked together by hydrogen bonds.
In DNA, there are four types of nucleotides, each containing one different nitrogenous base (i.e., Adenine, Guanine, Cytocine and Thymine).
In RNA, Thymine bases are replaced by Uracil bases.
According to the base pair rules, Adenine (A) always pairs with Thymine (T), whereas Cytosine (C) always pairs with Guanine (G).
In conclusion, the complementary DNA sequence of CGTA is GCAT.
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A variable that is held constant in order to assess or clarify the relationship