1. Warm up for today How many times does DNA replicate during meiosis? How many times does DNA replicate during meiosis? OnceOnce TwiceTwice Three timesThree times Four timesFour times During the process of meiosis DNA replicates During the process of meiosis DNA replicates twice and divides once.twice and divides once. twice and divides twice.twice and divides twice. once and divides once.once and divides once. once and divides twice.once and divides twice.

2. Warm up for today An offspring of two parents had an extra chromosome in its karyotype. The most likely cause of this condition would have been An offspring of two parents had an extra chromosome in its karyotype. The most likely cause of this condition would have been a point mutation.a point mutation. translocation.translocation. nondisjunction.nondisjunction. a nonsense mutation.a nonsense mutation. Which statement below correctly describes what happens to DNA during the formation of sex cells?Which statement below correctly describes what happens to DNA during the formation of sex cells? When DNA replicates, each of the two new DNA molecules has one old strand and one new strand. When DNA replicates, each of the two new DNA molecules has one old strand and one new strand. As a result of DNA replication, one DNA molecule is completely new and one remains as the original. As a result of DNA replication, one DNA molecule is completely new and one remains as the original. After the formation of sex cells the DNA molecules are a mix of old and new strands. After the formation of sex cells the DNA molecules are a mix of old and new strands. Each new sex cell contains a random, but equal amount of the original DNA molecules. Each new sex cell contains a random, but equal amount of the original DNA molecules.

3. Warm up for today Which molecule carries the code for traits of most organisms? Which molecule carries the code for traits of most organisms? Ribonucleic acidsRibonucleic acids CarbohydratesCarbohydrates Adenosine triphosphateAdenosine triphosphate Deoxyribonucleic acidsDeoxyribonucleic acids Which statement below best describes the role of DNA? Which statement below best describes the role of DNA? It is the main supplier of energy for cells.It is the main supplier of energy for cells. It is used to store energy in the body.It is used to store energy in the body. It carries information for building proteins.It carries information for building proteins. It serves as the memory molecule in brain cells.It serves as the memory molecule in brain cells.

4. Warm up for today Use the diagram below to answer the next question. Use the diagram below to answer the next question. What macromolecule results when these molecules and other like them are joined together? What macromolecule results when these molecules and other like them are joined together? Carbohydrate Carbohydrate Protein Protein Lipid Lipid Nucleic acid Nucleic acid

5. Warm up for today A molecule contains the original directions for the formation of proteins. In which structure would it most likely be found in a cell? A molecule contains the original directions for the formation of proteins. In which structure would it most likely be found in a cell? RibosomeRibosome NucleusNucleus Endoplasmic reticulumEndoplasmic reticulum Golgi apparatusGolgi apparatus A molecule that consists of two strands running in the opposite direction generally forms a(n) A molecule that consists of two strands running in the opposite direction generally forms a(n) antiparrallel double helix.antiparrallel double helix. parallel double helix.parallel double helix. twisted ladder shape.twisted ladder shape. coiled spring-like shape coiled spring-like shape

6. Warm up for today DNA is found in all the following cell structures EXCEPT the DNA is found in all the following cell structures EXCEPT the nucleus.nucleus. mitochondria.mitochondria. chloroplastschloroplasts ribosomes.ribosomes. Which of the following describes the normal shape of a DNA molecule? Which of the following describes the normal shape of a DNA molecule? It forms a double helix.It forms a double helix. It consists of a single helix.It consists of a single helix. It contains two straight strands.It contains two straight strands. It is formed from a single stand.It is formed from a single stand.