DNA Structure and Replication Wizer

Master DNA structure and replication with our interactive 9th-grade biology worksheet!

DNA Structure video Watch the video to review DNA Structure before you answer the questions below. DNA Replication Video Watch the video to review DNA Replication before you answer the questions below. How to Make A Complementary Strand (Replication Example Problem) Watch this video to understand how to find the complementary strand of a DNA strand. Reminder A pairs with T and G pairs with C. You only need to watch about the first minute of the video. The Nucleotide Label the components of the nucleotide. Use the following word bank: deoxyribose sugar, nitrogenous base, phosphate. phosphate deoxyribose sugar nitrogenous base Fill in the blanks below. (Be careful on spelling!) DNA stands for deoxyribonucleicacid. (Spelling counts here, so be careful!)The structure of DNA was first determined by two scientists whose last names were Watsonand Crick.The shape of DNA is best known as a double helix Which type of organic macromolecule is DNA? carbohydrate lipid protein nucleic acid DNA is composed of monomers called _. amino acids nucleotides monosaccharides nitrogenous bases Which of the following is NOT a component of a DNA nucleotide? deoxyribose sugar nitrogenous base uracil phosphate group The bonds that hold nitrogenous base pairs together are called _, which are relatively _ bonds because they have to be able to unzip during DNA replication. covalent, weak covalent, strong hydrogen, weak hydrogen, strong DNA contains the code to make _. proteins carbohydrates energy lipids The diagram below shows a segment of DNA. Use the diagram to match the terms with the labeled structures. A Deoxyribose sugar B Phosphate group C Nitrogenous base D Nucleotide Match the complementary base pairs of DNA. Adenine Thymine Guanine Cytosine Thymine Adenine Cytosine Guanine DNA Structure Fill in each of the blank spaces to label the DNA Structure. Use the following answer choices: A, A, G, G, G, T; covalent bonds, deoxyribose sugar, hydrogen bonds, nucleotide, phosphate group. A G T A G G nucleotide phosphate group deoxyribose sugar covalent bonds hydrogen bonds Chargaff's Rule According to Chargaff's Rule, DNA strands contain equal amounts of A and T and then equal amounts of G and C. (For example, if a DNA double helix contains 20% Adenine, then it must also contain 20% Thymine because every time there is an A on one strand of DNA, there is a T on the other side that is paired with it. Since 40% of the double helix is A and T, then the rest--60%--must be G and C. Of that 60%, half must be G and the other half must be C. So G is 30% and C is 30%.) Use Chargaff's rule to complete the chart below. Bases Percentage Adenine 15 Cytosine 35 Thymine 15 Guanine 35 Total 100 Chargaff's Rule See instructions in previous question for help. Bases Percentage Adenine 10 Cytosine 40 Thymine 10 Guanine 40 Total 100 When is DNA usually copied when proteins are made before a cell divides during metabolism when a cell creates energy A strand of DNA contains these letters: A-C-T-T-A-G. When it is replicated, what will the complementary strand be? ACTTAG TGAATC GCAAGC TCAATG What is the complementary DNA strand? NOTE: make sure the letters you type are capitalized! C A G A T G C A G A T G T G During DNA replication, which enzyme "unzips" the DNA double helix? ligase DNA polymerase gyrase helicase After DNA replication, one side of the double helix is the original strand and one side is the new strand. This method of replication, where half is old and half is new, is called _ replication. semiconservative old-and-new repetitive interphase