Examlex
What is the origin of petroleum?
Gene
The basic unit of heredity. Genes are composed of deoxyribonucleic acid (DNA).
Zygote
The initial cell formed when a new organism is conceived, created by the merging of female and male reproductive cells.
Cytosine
One of the four main nucleobases found in DNA and RNA, which pairs with guanine.
Chromosomes
Thread-like structures located inside the nucleus of animal and plant cells, made of protein and a single molecule of DNA, carrying genetic information.
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