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Mrs. Stewart Biology Standard What would most likely result if nitrogen-fixing bacteria in an area were destroyed? Vegetation in the area would grow at a faster rate Vegetation in the area would grow at a slower rate Vegetation in the area would not be affected Vegetation in the area would find other nutrient sources In certain species of guinea pigs, black fur is dominant to white fur. If a white male guinea pig is crossed with a black homozygous dominant female, what is the probability of having offspring with black fur? 100% 75% 50% 25% Which factor is most likely to initiate the process of succession in which a deep freshwater lake becomes a woodland area? Accumulation of sediment Growth of microorganisms Change in the pH of the lake water Increase in the invertebrate population What is the mode of inheritance for this disorder? A nonsex-linked dominant trait A nonsex-linked recessive trait A sex-linked trait carried on the Y chromosome A sex linked trait carried on the X chromosome A growth curve for a population of crabs is shown. What is happening at Point A? A Population growth decreases as individual crabs get older The population is stabilizing as it approaches carrying capacity Destruction of habitat is causing a decline in the population of the crabs Intro. Of a new predator is causing a decline in population growth of crabs Meiotic cell division results in gametes that produce sperm & egg cells by: Reducing the daughter chromosome number by 75% Reducing the daughter chromosome number by 50% Increasing the daughter chromosome number by 50% Increasing the daughter chromosome number by 75% An ecosystem has a stable population of whitetailed deer. What is the most likely outcome if a new species of deer that competed for the same resources were introduced? The white tailed deer population would increase The producer population would decrease The white tailed deer population would not be affected The predator population would decrease Which process most contributes to genetic variation in a population? Crossing over during meiosis Chromsome replication during mitosis Cytokinesis during cellular division Duplication of chromosomes in asexual reproduction Scientists have developed a way to analyze and compare DNA sequences between humans. Using this genetic info would be most beneficial for: Identifying individuals Dating the age of fossils Creating new gene sequences Determining proteins produced in skin cells According to the data table, which statement best supports the student’s conclusion? Subjects Q and S have the same resting blood pressure Subjects Q and R are different ages Subjects R and T have different resting blood pressure Subjects S and T are the same gender Test subject Age Gender Resting heart rate Resting blood pressure Q 15 M 70 115/80 R 32 M 70 115/80 S 15 F 76 115/80 T 32 F 76 152/98 C6H12O6 + 6O2 6CO2 + 6H20 + 36 ATP Which process does this equation represent? Photosynthesis Aerobic respiration Anaerobic respiration Nitrogen fixation One species of bird arrives on an island chain. Different species evolve from the original species to adapt to different available niches. This is an example of: Divergent evolution Convergent evolution Dynamic equilibrium Graduated equilibrium Based on the name alone, which macromolecule category would “Lactase” belong? Nucleic Acids Carbohydrates Proteins Lipids Based on the data table, which molecules are present in the unknown solution? Starches and lipids Proteins and starches Sugars and proteins TESTING INDICATOR OBSERVATION Lipids and proteins IODINE Brownish-orange BENEDICT’S SOLN Orange BIURET SOLN Purple BROWN PAPER BAG No mark left A forest area is being harvested, causing a reduction in resources. The organism most likely to become extinct as a result is: One with a specialized diet One with a high rate of reproduction One that feeds from a variety of sources One that has a great amount of genetic variation Which statement identifies the cells correctly? Cell 1 is prokaryotic; cell 2 is eukaryotic Cell 1 is eukaryotic; cell 2 is prokaryotic Both cells are prokaryotic Both cells are eukaryotic Cell 1 Cell 2 What is the most likely reason the species shown have similar limb structures? Share a common ancestor Use their limbs for the same functions Occupy the same level in a food pyramid Adapted to the same environment Eastern Bluebird Western Kingbird Oven bird Robin Family Turdidae Tyranidae Parulidae Turdidae Genus Sialia Tyrannus Seiurus Turdus Species sialis verticalis aurocapillus migratorius Western kingbird and ovenbird Eastern bluebird and robin Western kingbird and eastern bluebird Robin and ovenbird Which two birds are most closely related? How will a researcher verify that his results are free from bias? Extending his research for three more years Investigating similar products and their results Testing a larger population of subjects using different brands Having an independent research company perform the same investigation Antibodies are composed primarily of amino acids. In which class of biomolecules would antibodies belong? Nucleic acids carbohydrates proteins lipids Which organism on the energy pyramid receives the least amount of energy from the producer? whales seals herring krill whales Seals Herring Krill Phyloplankton An inventor builds and markets a product. Which step has he neglected to do? Identify a need Define the problem Narrow the research Verify the results The physical differences among the fish are most likely: A feeding adaptation due to competition for food A swimming adaptation due to water temperature An osmotic adapation due to salinity levels A respiration adaptation due to different oxygen levels Which tool is best for a student to use to observe mitosis in an onion root tip? Gel electrophoresis Triple beam balance microscope flask What would most likely result if a waterborne bacteria caused the death of most of the minnow population? Decrease in both algae and zooplankton population Increase in both zooplankton and perch population Increase in both perch and hawk population Decrease in both perch and hawk population Algae Zooplankton Minnow Perch Hawk Which statement best describes the interdependence of photosynthesis and cellular respiration? The products of photosynthesis are carbon dioxide and water to be used in cellular respiration The reactants of photosynthesis are the products of cellular respiration The reactants of photosynthesis are sugar and oxygen to be used in cellular respiration The products of photosynthesis are the same as the products of cellular respiration During protein synthesis, a section of the DNA molecule is copied into which other molecule? Nucleic DNA Cytoplasmic DNA Messenger RNA Transfer RNA Which set of chromosomes shows a mutation? 2 11 16 23 The enzyme catalase is involved in the breakdown of hydrogen peroxide into water and oxygen. During this reaction, catalase: Is unchanged Is used up Is changed into a product Is formed into a new enzyme Enzymes… Provide CO2 for chemical reactions Heat up molecules so they can react Absorb excess heat so that reactions occur at lower temperatures Are biological catalysts Zebra mussels have spread quickly through the Great Lakes region. They reproduce quickly and have few natural predators. What will most likely happen to other native mussel species in that region? Native species will begin to interbreed with zebra mussels Native species will decrease in areas with large zebra mussel populations Native species will mutate to become more similar to zebra mussels Native species will mutate to become less similar to zebra mussels Animals store glucose in the form of… lipids wax glycogen cellulose The graph below represents which type of reaction? Exothermic Endothermic Exergonic In the reaction below, which stage is decreased by the addition of a catalyst? EA kJ AH The structure below is most likely found in… Fatty acids proteins carbohydrates Nucleic acids