A researcher found a mutation that resulted in the PFK enzyme being unable to bind ATP to the allosteric site. Telophase II. D) peas have an unusually long generation time. Only cells with such receptors are capable of responding. The flower color trait in radishes is an example of which of the following? E) It is a method that can be used to determine the number of chromosomes in a plant. Which of the following best describes the component that metaformin represents the signal transduction pathway that regulates glucose production in the liver? Mendel accounted for the observation that traits which had disappeared in the F1 generation reappeared in the F2 generation by proposing that. Metaphase IIIII. In animals, meiosis results in gametes, and fertilization results in. When crossing an organism that is homozygous recessive for a single trait with a heterozygote, what is the chance of producing an offspring with the homozygous recessive phenotype? Which of the following best predicts the effect of the mutation? The karyotype of one species of primate has 48 chromosomes. A sexually reproducing animal has two unlinked genes, one for head shape (H) and one for tail length (T). Which of the following about the law of segregation is false? Oh no! A) All +bt +vg heterozygotes. Anaphase IIIV. If 1,000 F2 offspring resulted from the cross, approximately how many of them would you expect to have red, terminal flowers? Chiasmata are what we see under a microscope that let us know which of the following is occurring? 75% of the virus infected cells are found in mitosis. Which of the following best explains a possible mechanism that would enable the hormone to efficiently reach all of the target cells in the body? It looks like your browser needs an update. AP Biology Exam. What was the most significant conclusion that Gregor Mendel drew from his experiments with pea plants? A dwarf, red snapdragon is crossed with a plant homozygous for tallness and white flowers. C) A dihybrid cross involves organisms that are heterozygous for two characters and a monohybrid only one. The Pre-AP Biology course emphasizes the integration of content with science practicesâpowerful reasoning tools that support students in analyzing the natural world around them. Tallness (T) in snapdragons is dominant to dwarfness (t), while red (R) flower color is dominant to white (r). In snapdragons, heterozygotes for one of the genes have pink flowers, whereas homozygotes have red or white flowers. E) The statement is true for mitosis and meiosis II. In certain plants, tall is dominant to short. D) A display of every pair of homologous chromosomes within a cell, organized according to size and shape. Black fur in mice (B) is dominant to brown fur (b). B) The statement is true for meiosis I only. Discover new music on MTV. In a particular female, cell division goes awry and she produces one of her eggs with an extra chromosome (25). This suggests. A cell divides to produce two daughter cells that are genetically different. You have 90 minutes to complete each section, and each section will account for half of your grade. D) include genes that determine an individual's sex. The heterozygous condition results in pink (Rr) flower color. Which of the following is true of a species that has a chromosome number of 2n = 16? A cross between homozygous purple-flowered and homozygous white-flowered pea plants results in offspring with purple flowers. 6) How many unique gametes could be produced through independent assortment by an individual with the genotype AaBbCCDdEE? Based on the data, the percent of mitotic cells that were in metaphase is closest to which of the following? In a cross AaBbCc à AaBbCc, what is the probability of producing the genotype AABBCC? We extended the deadline for final digital submission of AP Art and Design portfolios and AP Computer Science Principles (CSP), AP Seminar, and AP Research performance tasks to Thursday, May 20, 2021, 11:59 p.m. EDT. Get the latest music news, watch video clips from music shows, events, and exclusive performances from your favorite artists. Which statement provides the evidence to justify the claim that signal transduction may result in an altered pathway? Asexual reproduction and sexual reproduction differ in all but which of the following ways? E) Asexual reproduction is utilized only by fungi and protists, whereas sexual reproduction is utilized only by plants and animals. If a cell of a usually diploid species with 42 chromosomes per cell is triploid, this cell would be expected to have which of the following? D) All of the genes controlling the traits behaved as if they were on different chromosomes. D) that the parents were both heterozygous. One parent has red, axial flowers and the other has white, terminal flowers; all F1 individuals have red, axial flowers. Biology is brought to you with support from the. Which of the following changes in the FGFR signaling pathway is most likely to result in uncontrolled cell proliferation? The AP Biology test is divided into two sections. more cells are produced per unit of time in the root tips growing in compact sand than the root tips growing in loose sand. The output of each program is a set of HTML commands, which is rendered by your web browser as a standard web page. When plants with red flowers are crossed with plants with white flowers, what proportion of the offspring will have pink flowers? B) The statement is true for meiosis I only..; Homologous chromosomes synapse and crossing over occurs. Learn vocabulary, terms, and more with flashcards, games, and other study tools. It was important that Mendel examined not just the F1 generation in his breeding experiments, but the F2 generation as well, because. Which of the following outcomes will most likely result from the inactivation of the Beta-2 adregonic receptor? The test was to be conducted during the day-shift of 25 April 1986 as part of a scheduled reactor shut down. Designing experiments and procedures to test a prediction or theory. Start studying AP Bio Unit 4. Based on the sample means, which of the following conclusions about the cells in the growing root tips of zea mays seedlings is best supported by the results of the experiment? An experiment showed that a mutation in the Ced-9 gene led to excessive cell death in C. elegans. Immediately after the meal, the blood glucose level will increase, and then insulin will be secreted to counter the increase. A triploid cell contains three sets of chromosomes. A given organism has 46 chromosomes in its karyotype. Caffeine is a central nervous system (CNS) stimulant of the methylxanthine class. Two characters that appear in a 9:3:3:1 ratio in the F2 generation should have which of the following properties? Unit: Gene expression and regulation. Mendel's second law of independent assortment has its basis in which of the following events of meiosis I? A) the random and independent way in which each pair of homologous chromosomes lines up at the metaphase plate during meiosis I. Pea plants were particularly well suited for use in Mendel's breeding experiments for all of the following reasons except that. Unlike many other psychoactive substances, it is legal and unregulated in nearly all parts of the world. They allow the movement of molecules from one cell to another, enabling communication between cells. Chromatids are separated from each other. Negative feedback regulation does not occur, so the enzyme will be active when glycolysis is not needed. B) parental traits that were not observed in the F1 reappeared in the F2. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Which statement best predicts why a cell's progression through the cell cycle might be halted by the G1/S checkpoint? What proportion of the progeny will be expected to phenotypically resemble the first parent? AP Bio: IST (BI), ISTâ1 (EU), ISTâ2 (EU) AP®ï¸/College Biology. Metaphase I VI. Chemicals are secreted from antigen-presenting cells that then activate helper T-cells. Scheduled maintenance: Saturday, December 12 from 3â4 PM PST How many different types of gametes would be possible in this system? Mendel's observation of the segregation of alleles in gamete formation has its basis in which of the following phases of cell division? The following questions refer to the essential steps in meiosis described below. Telophase I VIII. This demonstrates, The F1 offspring of Mendel's classic pea cross always looked like one of the two parental varieties because. A) one phenotype was completely dominant over another. ... Start Unit test. Not all cells have receptors for epinephrine. There is a change from 3 to 6 picograms of DNA because DNA is replicated before each round of cell division. The genes for flower color and location assort independently. The virus stimulates frequent cell division. We can therefore conclude which of the following? Which of the following justifies the claim that differences in the components of cell signaling pathways explain the different responses to epinephrine? It is a ligand that activates the signal transduction pathway of the activation of AMPK. Prophase IV. The most probable source of this error would be a mistake in which of the following? Short tails (T) are dominant to long tails (t). The day shift crew had been instructed in advance on the reactor operating conditions to run the test and in addition, a special team of electrical engineers was present to conduct the one-minute test of the new voltage regulating system once the correct conditions had been reached. It looks like your browser needs an update. For the following questions, match the key event of meiosis with the stages listed below.I. Which of the following statements is consistent with the data in figure 1? The Sequence Manipulation Suite is a collection of web-based programs for analyzing and formatting DNA and protein sequences. What fraction of the progeny of the cross BbTt à BBtt will have black fur and long tails? What are the genotype and phenotype of the F1 individuals? B) The genes controlling the characters obey the law of independent assortment. Get the latest science news and technology news, read tech reviews and more at ABC News. If the SRY gene is absent or nonfunctional, the embryo will exhibit female sexual development. What typically occurs first once a chemical messenger reaches a target cell? To ensure the best experience, please update your browser. Cell signaling depends on the ability to detect a signal molecule. Its genotype is HhTt. If a homozygous bent wing fly is mated with a homozygous vestigial wing fly, which of the following offspring would you expect? Which of the following happens at the conclusion of meiosis I? Legend (Opens a modal) Possible mastery points. B) Traits are inherited in discrete units, and are not the results of "blending.". Radish flowers may be red, purple, or white. Which of the following occurs in meiosis but not in mitosis? Which of the following describes a critical role of the cAMP during the transduction stage of a G protein signal transduction pathway? A cross between a red-flowered plant and a white-flowered plant yields all-purple offspring. Drosophila (fruit flies) usually have long wings (+) but mutations in two different genes can result in bent wings (bt) or vestigial wings (vg). Based on table 1, what percent of the life cycle of yeast cells is spent in DNA replication? Based on figure 1, which of the following statements correctly links a stage of the cell cycle with the event occurring at that stage? Which of the following statements best predicts the effect of a loss of function of the insulin receptor's intracellular domain? After telophase I of meiosis, the chromosomal makeup of each daughter cell is. the irreversible association of FGFR proteins. E) His experiments with the breeding of plants such as peas. Which of the following statements best justifies the claim that changes in the expression of ced-9 in C. elegans can affect regulation of apoptosis in the cell? 0. Based on the model, which of the following best predicts the effects of warfarin on a patient? Which of the following will most likely result from a loss of P53 function? If a heterozygous plant is crossed with a homozygous tall plant, what is the probability that the offspring will be short? Beginning in early March, AP coordinators will be able to assign students to Administration 2 and/or 3 exams, if needed. The fact that all seven of the pea plant traits studied by Mendel obeyed the principle of independent assortment most probably indicates which of the following? ... Unit 5: Heredity ... Once you join your AP class section online, youâll be able to access AP Daily videos, any assignments from your teacher, and your personal progress dashboard in AP Classroom. Which of the following genotypes is possible in a gamete from this organism? Biology is brought to you with support from the Amgen Foundation. There are not enough nucleotides available to construct DNA. Which of the following best describes the role of cell-to-cell communication during a response to an invasion of antigens? The hormone is released into the bloodstream where it can be transported to all cells with the correct receptors. D) At sexual maturity, ovaries and testes produce diploid gametes by meiosis. C) traits can be dominant or recessive, and the recessive traits were obscured by the dominant ones in the F1. Oh no! Which of the following statements best describes a primary function of plasmodesmata? Which of the following crosses would produce offspring in the ratio of 1 red : 2 roan : 1 white. The part of the radish we eat may be oval or long, with long being the dominant characteristic. To ensure the best experience, please update your browser. Increased cell division will lead to the formation of a tumor. It is the world's most widely consumed psychoactive drug. cAMP results in the activation of an enzyme that amplifies the signal by acting on many substrate molecules. which of the following best predicts what will happen to the blood glucose levels if the person has another meal after 5 pm? Part A of Section I consists of 63 multiple choice questions. Which of the following best predicts the effect of a mutation that causes EGFR to be active in the absence of a growth factor? Collecting and analyzing data. Pre-AP Biology sparks student motivation and critical thinking about our living world as they engage in real-world data analysis and problem solving. What is the difference between a monohybrid cross and a dihybrid cross? New AP Course Pacing Guide This pacing guide (.pdf/156.44 KB), designed for classrooms that have only completed approximately 25% of typical course content by January, can help students develop their knowledge and skills by May. Which of the following most accurately describes an observation and an effect of the viral infection indicated in table 1? the storage of GLUT4 in vesicles inside the cell will increase. D) haploid, and the chromosomes are each composed of two chromatids. Two true-breeding stocks of pea plants are crossed. Anaphase I VII. 25) Given the parents AABBCc à AabbCc, assume simple dominance and independent assortment. Mendel was able to draw his ideas of segregation and independent assortment because of the influence of which of the following? Section I is multiple choice and Section II is free response. Prophase IIII. In cattle, roan coat color (mixed red and white hairs) occurs in the heterozygous (Rr) offspring of red (RR) and white (rr) homozygotes. Independent assortment of chromosomes occurs. How does the sexual life cycle increase the genetic variation in a species? A) By allowing independent assortment of chromosomes, Independent assortment of chromosomes is a result of. Factor X will not be activated, which will prevent thrombin from forming. 7) Two plants are crossed, resulting in offspring with a 3:1 ratio for a particular trait. Start studying Unit 5 AP Bio Multiple Choice. Skin color in a certain species of fish is inherited via a single gene with four different alleles. A 1:2:1 phenotypic ratio in the F2 generation of a monohybrid cross is a sign of. The rate of glycogen synthesis in the cell will increase. Synthesis of sufficient DNA for two daughter cells occurs in stage II.