source,graphics_name,topic,id,question,choice1,choice2,choice3,choice4,solution
https://www.education.pa.gov/Documents/K-12/Assessment%20and%20Accountability/Keystone%20Exams/Keystone%20Exams%20Item%20and%20Scoring%20Samplers/2021%20Keystone%20ISS%20Biology.pdf,None,Biology,1405,"BIOLOGY: Carbon can combine with many different elements but frequently combines with oxygen, hydrogen, and nitrogen to form organic molecules. Which statement best explains why carbon is able to form a large number of different molecules?",Carbon forms only ionic bonds. ,Carbon can form only ring structures. ,Carbon can form four covalent bonds. ,"Carbon forms small, simple structures. ",Carbon can form four covalent bonds. 
https://www.education.pa.gov/Documents/K-12/Assessment%20and%20Accountability/Keystone%20Exams/Keystone%20Exams%20Item%20and%20Scoring%20Samplers/2021%20Keystone%20ISS%20Biology.pdf,None,Biology,1406,BIOLOGY: Which statement correctly describes how a protein is formed?,A monosaccharide bonded to a side chain is broken apart. ,Amino acids are bonded together in a long chain to form a new molecule. ,A molecule containing glycerol bonded to three fatty acids is broken apart. ,"A nitrogenous base, a sugar, and a phosphate group combine to form a new molecule. ",Amino acids are bonded together in a long chain to form a new molecule. 
https://www.education.pa.gov/Documents/K-12/Assessment%20and%20Accountability/Keystone%20Exams/Keystone%20Exams%20Item%20and%20Scoring%20Samplers/2021%20Keystone%20ISS%20Biology.pdf,biology_1407,Biology,1407,BIOLOGY: Which biological molecules are most likely represented by molecules 1 and 2?,"molecule 1: lipid, molecule 2: nucleic acid","molecule 1: lipid, molecule 2: protein","molecule 1: carbohydrate, molecule 2: nucleic acid","molecule 1: carbohydrate, molecule 2: protein","molecule 1: lipid, molecule 2: nucleic acid"
https://www.education.pa.gov/Documents/K-12/Assessment%20and%20Accountability/Keystone%20Exams/Keystone%20Exams%20Item%20and%20Scoring%20Samplers/2021%20Keystone%20ISS%20Biology.pdf,None,Biology,1411,"BIOLOGY: A cell in the leaf of a green plant performs both photosynthesis and cellular respiration, often at the same time. Which statement best describes how these processes are related to each other?",Both processes produce carbon dioxide. ,Both processes require energy directly from the Sun. ,Products of one process are used as some of the reactants for the other process. ,Thermal energy from one process is used as the energy source for the other process. ,Products of one process are used as some of the reactants for the other process. 
https://www.education.pa.gov/Documents/K-12/Assessment%20and%20Accountability/Keystone%20Exams/Keystone%20Exams%20Item%20and%20Scoring%20Samplers/2021%20Keystone%20ISS%20Biology.pdf,None,Biology,1412,"BIOLOGY: A scientist observed that during the course of a chemical reaction the number of ATP molecules
was reduced. What did the scientist most likely learn from the observation?",The reaction produced water. ,The reaction consumed water. ,The reaction caused an output of energy. ,The reaction required an input of energy. ,The reaction required an input of energy. 
https://www.education.pa.gov/Documents/K-12/Assessment%20and%20Accountability/Keystone%20Exams/Keystone%20Exams%20Item%20and%20Scoring%20Samplers/2021%20Keystone%20ISS%20Biology.pdf,biology_1414,Biology,1414,BIOLOGY: Which cell process is best modeled by the diagram?,osmosis,passive transport,exocytosis,facilitated diffusion,exocytosis
https://www.education.pa.gov/Documents/K-12/Assessment%20and%20Accountability/Keystone%20Exams/Keystone%20Exams%20Item%20and%20Scoring%20Samplers/2021%20Keystone%20ISS%20Biology.pdf,None,Biology,1416,BIOLOGY: Which statement best describes the outcomes of both meiosis and mitosis?,Cell division results in daughter cells that contain DNA. ,Each daughter cell has two complete sets of chromosomes. ,"Within a cell, two chromosomes pair up and exchange segments of genetic material. ",Genetically identical daughter cells are produced that can function as body cells or sex cells. ,Cell division results in daughter cells that contain DNA. 
https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:cells-and-organisms/x0c5bb03129646fd6:cells-organisms/e/understand-cells-and-organisms?modal=3,None,Biology,1430,BIOLOGY: Which of the following is true?,Organisms can be made up of many cells or a single cell.,All organisms are made up of a single cell.,All organisms are made up of many cells.,None,Organisms can be made up of many cells or a single cell.
https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:cells-and-organisms/x0c5bb03129646fd6:cell-parts-and-functions/e/apply-cell-parts-and-functions?modal=3,None,Biology,1434,BIOLOGY: Through which process is pollen transferred from male to female flower parts?,fertilization,pollination,seed formation,cross-pollination,pollination
https://www.khanacademy.org/science/high-school-biology/test/subject-challenge?modal=1,None,Biology,1435,BIOLOGY: A biologist looks at an organism through a microscope. Which of the following observations tells the biologist that the organism is eukaryotic?,It moves with flagella.,It has membrane-bound organelles.,It has a cell membrane,It is unicellular,It has membrane-bound organelles.
https://www.khanacademy.org/science/high-school-biology/test/subject-challenge?modal=6,None,Biology,1440,BIOLOGY: Which of the following describes the role of lipids?,Enzyme function,Energy storage,Transmission of genetic information,Energy conversion,Energy storage
https://www.khanacademy.org/science/high-school-biology/test/subject-challenge?modal=7,biology_1441,Biology,1441,BIOLOGY: Provided are two sequences of a segment of DNA. Which type of mutation has occurred?,Insertion,Deletion,Substitution,Nonsense,Substitution
https://www.khanacademy.org/science/high-school-biology/test/subject-challenge?modal=8,None,Biology,1442,"BIOLOGY: In horses, black coloring (B) is dominant, and chestnut coloring (b) is recessive. A homozygous black horse crosses with a chestnut horse. What percentage of offspring are expected to be chestnut?",100%,50%,25%,0%,0%
https://www.khanacademy.org/science/high-school-biology/test/subject-challenge?modal=9,biology_1443,Biology,1443,BIOLOGY: The scale shows the pH levels of various liquids. Which of the following substances is a strong base?,soda,bleach,blood,lemon juice,bleach
https://www.khanacademy.org/science/high-school-biology/test/subject-challenge?modal=12,None,Biology,1446,BIOLOGY: A carefully placed paperclip can float on top of water without sinking. Which property of water allows the paperclip to float?,Capillary action,pH,High specific heat,Surface tension,Surface tension
https://www.khanacademy.org/science/high-school-biology/test/subject-challenge?modal=16,biology_1450,Biology,1450,BIOLOGY: Which of the following diagrams represents a negatively charged ion?,A,B,C,None,C
https://www.nysedregents.org/Chemistry/,None,Biology,1451,BIOLOGY: Which term identifies a type of intermolecular force?,covalent bonding,hydrogen bonding,ionic bonding,metallic bonding,hydrogen bonding
http://mcas.pearsonsupport.com/resources/student/practice-tests-science/HS-Chem.pdf,None,Biology,1454,BIOLOGY: The correct name for an aqueous solution of HCl is _____.,chloric acid,chlorous acid,hydrochloric acid,hydrogen chloride,hydrochloric acid
https://www.nysedregents.org/Chemistry/,None,Biology,1459,BIOLOGY: Which particles are transferred during a redox reaction?,atoms,electrons,neutrons,positrons,electrons
https://www.nysedregents.org/Chemistry/,None,Biology,1460,BIOLOGY: Which substance can not be broken down by chemical means?,aluminum,ammonia,aluminum oxide,ammonium chloride,aluminum