Biology

3. A cell that contains both sets of homologous chromosomes.
7. The range of physical and biological conditions in which a species lives and the way the species obtains what it needs to survive and reproduce.
10. The different forms of a gene.
11. Regions of DNA that have specific base sequences.
12. Biome characterized by permafrost, cold temperatures, and high winds.
14. Small particles of RNA and protein found throughout the cytoplasm in all cells.
15. The plants' principal pigment.
16. The day-to-day condition of Earth's atmosphere.
17. First set of reactions in cellular respiration in which a molecule of glucose is broken into two molecules of pyruvic acid.

1. Innermost compartment of the mitochondrion and the site of the Krebs cycle reactions.
2. The full set of genetic information that an organism carries in its DNA.
4. The process by which particles move from an area of high concentration to an area of lower concentration.
5. Group of three bases on a tRNA molecule that are complementary to the three bases of a codon of mRNA.
6. Organisms that live attached to or near the bottom of lakes, streams, or oceans.
8. A kind of virus that infects bacteria.
9. Specialized structure that performs important cellular functions within a eukaryotic cell.
13. Fourth stage of mitosis where the chromosomes begin to spread out into a tangle of chromatin.
18. Basic unit of life.