Ap Bio Practice Exam 1 With Complete Questions And Answers

Which of the following best explains why a cell's plasma membrane is composed of two layers of phospholipids rather than just a single layer? {Ans: Having two oppositely oriented layers of phospholipids allows only the hydrophilic heads to interact with water inside and outside of the cell}Which of the following describes a scenario that would result in the phenotypic change shown in the graph? {Ans: House sparrows that lay smaller-than-average clutches of eggs produce fewer viable offspring, while larger-than-average clutches of eggs result in malnourished chicks that have a higher mortality rate}As otters were removed during the hunting years, there was a large decrease in the catches of fish species from the eelgrass habitats. Which of the following best explains why this decrease happened? {Ans: Otters are a keystone species, so their disappearance from the area resulted in the collapse of an entire community}Which of the following best explains why triploid bananas do not produce seeds? {Ans: The production of gametes is disrupted because of unequal pairing of homologous chromosomes during meiosis}The diploid number of chromosomes in the cell of a domesticated dog is 78. Which of the following options includes the correct number of chromosomes