| Term | Definition |
| What are genes carried on? | Chromosomes |
| In DNA, nucleotides are composed of _________. | In DNA, nucleotides are composed of a 5-carbon sugar (deoxyribose) attached to a phosphate group and a nitrogenous base A, T, C, or G. |
| Is DNA polar? | DNA is polar |
| In DNA, adenine pairs with: | Thymine |
| In DNA, guanine pairs with: | Cytosine |
| How many base pairs per helical turn? | 10 |
| Cytosine and thymine use a single-ring base called ____. | Pyrimidine |
| Adenine and guanine use a bulky 2-ring base called ____. | Purine |
| Genome | complete set of an organisms information |
| Karyotype | total chromosomes (human karyotype is 46) |
| Telomere | DNA at the end of a chromosome to protect it |
| Centromere | The middle of a chromosome where the sister chromatids meet |
| Nucleolus | Where the ribosomal RNAs are synthesized and combined with proteins to form ribosomes |
| Histones | A protein that binds to the DNA (in eukaryotes) |