guanine
guanine — noun
1. a nitrogen-containing base found in the cells of all living things; it is one of
a nitrogen-containing base found in the cells of all living things; it is one of just four kinds of molecule that spell out the genetic instructions in DNA and RNA — and in the DNA double helix it always pairs with cytosine
Daichi asked his biology teacher why guanine always pairs with cytosine and never with adenine in the DNA helix.
guanine always pairs with cytosine in the DNA double helix
Dr. Hamza showed Anya the gene sequence, pointing to where a guanine had been replaced by adenine.
Lakan watched the PCR machine build new DNA strands, with guanine nucleotides slotting into place opposite every cytosine.
Jude's lab team studied how oxidised guanine in DNA can trigger the mutations that lead to skin cancer.
Zola read the DNA sequence printout, circling every guanine in yellow to check for mutations.
用法筆記
Guanine is the free base; when attached to a sugar molecule it becomes guanosine, and with a sugar plus a phosphate group it forms guanylate.