In meiosis, crossing over takes place during prophase I. View Unit 3 FRQ.docx from ECON 101 at China Australia Business College of Shanxi. The normal red blood cell has an average surface area of 136μm2 and an average volume of 91μm3. There are four questions in the free-response section. A scientist is studying the various prokaryotic and eukaryotic species found floating in a sample of water taken from a marine ecosystem. The results of the experiment are represented in the table. The surface-to-volume ratio of these cells affects the efficiency of material exchange. The speed at which various substances crossed this membrane was measured. The results of the experiment are presented in the table. Somatic cells, like the one pictured here in metaphase, are diploid. First define the variables and then create a chart: Duchenne muscular dystrophy affects 1 in 3,500 males born in the United States. If the diploid number is 10, then the organism inherited 5 chromosomes from each parent (the haploid number). Nasıl Satın Alabilirim? In order for the mutation to be passed down to offspring, it must affect the gametes. Aldosterone (a steroid hormone) is a small, nonpolar, hydrophobic molecule that enters a target cell by moving across the plasma membrane, down a concentration gradient. The correct answer is (A). Questions 1 and 2 are long free-response questions that require about 22 minutes each to answer and are worth 10 points each. Chloroplasts and some prokaryotes share similar photosynthetic reactions. In a typical human cell, only about 20% of the genes it contains are expressed (even less in muscle and nerve cells), even though almost all the cells in the organism contain the same DNA. Unit 3 Practice. The engulfed prokaryote then formed an endosymbiotic relationship with the eukaryotic host. Legend (Opens a modal) Possible mastery points. Multiple alleles exist when more than two alleles exist for a gene. This is resulted in an increased frequency of mating between members of species that had formerly been isolated reproductively. Meiosis produces gametes. Somatic cells, like the one pictured here in metaphase, are diploid. Include a substance known to block ATPATP use by the plasma membrane. In the cell cycle, crossing over takes place during metaphase. The correct answer is (C). Free-Response Questions Download free-response questions from past exams along with scoring guidelines, sample responses from exam takers, and scoring distributions. endstream endobj startxref These materials are part of a College Board program. Mitochondria are surrounded by a double membrane. Edit. Hydrolytic enzymes will be released, which will cause cell death. Introduction to genetic engineering (Opens a modal) Intro to biotechnology ... Level up on all the skills in this unit and collect up to 700 Mastery points! A magnesium sulfate solution taken orally can cause a net movement of water into the large intestine, which results from water molecules diffusing through aquaporins embedded in the cells of the intestinal lining. The set of genes expressed in each cell is unique, which allows the cells to perform different functions. Repeat the process with other salt concentrations. Two competing hypotheses exist regarding the cell membrane structure. After 30 minutes, 5 mL of a concentrated solution of albumin (a medium-sized, water-soluble protein) is added to one of the two beakers. Start studying AP Biology. Intravenous (IV) therapy is used for fluid replacement in instances of dehydration in humans and other animals. In some cases, you likewise accomplish not discover the broadcast ap biology unit 2 test answers … saundrarose TEACHER. In an experiment, the researchers incubate the cells in the presence of the protein and measure the amount of the protein that is absorbed into the cells over a five-minute period. An experiment is set up in which membrane proteins of two different cells are fluorescently labeled with two different colors and then fused as shown in Figure 1. it originated from the incorporation of a photosynthetic prokaryote into a eukaryotic cell by two endosymbiotic events. The ratio increases from 0.630.63 to 0.860.86, because more stomata are needed at higher CO2CO2 concentrations. The ratio is 1.121.12, and the cells are less efficient at transferring oxygen. The genes on each homolog are precisely aligned with the corresponding gene on the other homolog. The digital age. This significantly lowers the pH of the lysosome relative to the cytosol and activates the enzymes that digest the particles. Any items you have not completed will be marked incorrect. Biology is brought to you with support from the Amgen Foundation. Edit. Enzymes change the ends of the pre-mRNA molecule by adding a 5' cap to the 5' end. The correct answer is (A). Unit 2 progress check frq ap biology quizlet Exam Questions and Scoring Information 2020 Free-Response Questions. Unit 5 FRQs Progress Check Directions: Answers must be written out in paragraph form. Start Unit test. Your performance has been rated as %%RATING%%, Next Practice Test: Gene Expression & Regulation >> AP Biology Main Menu >>. Alternatively, the other hypothesis states that cell membranes are a fluid mosaic in which membrane components may drift within the bilayer around the surface of the cell. Which of the following observations best supports the claim that mitochondria evolved from once-free-living prokaryotic cells by the process of endocytosis? Use two additional treatments, one containing only ethyl alcohol and one containing only acetate. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Oh no! This disorder was traced to the absence of a muscle protein called dystrophin, for which the gene is located on X chromosome. Download free-response questions from past exams along with scoring guidelines, sample responses from exam takers, and scoring distributions. The researchers also observed that the inner mitochondrial membranes of plant X had more folds than did those of plant Y. Write your response in the space provided for each part of each question. Gaucher disease is an inherited disorder in which cells of the body are unable to break down a particular type of lipid, resulting in a buildup of the lipid in some tissues and organs. Researchers have proposed a model of chloroplast evolution. Hereditary spherocytosis (HS) is a disorder of red blood cells that causes the cells to be smaller and spherical instead of having the usual flattened, biconcave shape.