dna structure- 10th grade biology, Exams of Earth science

Download dna structure- 10th grade biology and more Exams Earth science in PDF only on Docsity! SNC 2D0 Looking Closer at DNA: The Genetic Material Date: _____________ ● DNA stands for ___________________________________________________________ ● It is found inside the cell’s __________________________________________________ ● Under a microscope DNA looks like a _________________________________________ DNA Structure 1. DNA is made of __________________ and rails of a ___________________. Each step is called a called nucleotide. 2. Each nucleotide consists of three parts: ● ● ● 3. DNA contains 4 different nitrogen bases: A – C – T - G – 4. The nitrogen bases pair together in the following manner: ● ____________________ pairs with ____________________: _____ - _____ ● ____________________ pairs with ____________________: _____ - _____ 5. The basic structure of DNA is helical, with the ______________ being stacked on top of each other. 6. The structure of DNA was discovered by two famous scientists: ______________________________ and _______________________________ in 1953. DNA FUNCTION 1. DNA is the storehouse of __________________________ that establishes each organism’s __________________________ characteristics. 2. DNA is like a __________________________________ because everyone’s is a little bit different. 3. Before a cell divides, the chromosomes must duplicate. This process is called DNA ________________________________. 1 SNC 2D0 4. A ___________________ is a short region of DNA that influences a particular characteristic in an organism. 5. The lengths of repetitive regions of DNA is compared between people. This process is called DNA _________________ and is used to identify a ___________________ . A suspect’s DNA can be matched to samples of ____________________, ___________________or_______________________. Color all the phosphates pink (one is labeled with a "p"). Color all the deoxyriboses blue (one is labeled with a "D"). Color the thymines orange. Color the adenines green. Color the guanines purple. Color the cytosines yellow. The combination of a single base, a deoxyribose sugar, and a phosphate make up a nucleotide. DNA is actually a molecule or repeating nucleotides. Examine the nucleotides closer. Two of the bases are purines - adenine and guanine. The pyrimidines are thymine and cytosine. Note that the pyrimidines are single ringed and the purines are double ringed. Color the nucleotides using the same colors as you colored them in the double helix. 2