Question

EOC Biology. 

A strand of DNA contains the sequence GGC-CAT. What is the complementary strand of mRNA for this sequence? Please help

Answer 1

CCG-GUA :) (because its an mRNA strand it can't have the amino acid Thymine or (T) so we replace it with a U.

Answer 2

GGC-CAT - strand of DNA
xxx- xxx - strand of mRNA
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The first, let's see what connect with what:
when we talk about DNA and complementary strand of DNA:
guanine connects to cytosine (and vice versa)
thymine connects to adenine (and vice wersa)

when we talk about DNA and complementary strand of RNA:
guanine connects to cytosine (and vice wersa)
adenine (in DNA) connects to uracil (in RNA)
thymine (in DNA) connects to adenine (in RNA)
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GGC- CAT - strand of DNA
CCG- GUA - complementary strand of mRNA

complementary strand of DNA would be: CCG- GTA
(in complementary strand of RNA: thymine is replaced with uracil)

Greetings,
n00nst00p :)