Presentation on theme: "Tuesday 10/30/12 A researcher observing an ecosystem describes the amount of sunlight, precipitation, and type of soil present. Which factors is the researcher."— Presentation transcript:
1Tuesday 10/30/12A researcher observing an ecosystem describes the amount of sunlight, precipitation,and type of soil present. Which factors is the researcher most likely describing?A. biotic factors in a forestB. biotic factors in a tundraC. abiotic factors in a prairieD. abiotic factors in an oceanC
2Wednesday /31/12Scientists observed that the populations of top-level consumers in a particular ecosystem were rapidly decreasing. Further studies revealed that there was also a decline in producer productivity. Which other changes did the scientists most likely observe in the ecosystem?A. increased producer diversityB. decreased population size at all levelsC. decreased primary consumer populations onlyD. increased primary and secondary consumer diversityB. Key: A decline in the producers of an ecosystem will cause a decrease in all other organisms because the producers are responsible for converting sunlight or chemical energy into usable energy for consumers.
3Describe one limiting factor for the moose population. CONSTRUCTED-RESPONSE QUESTION Use the graph below to answer the question:Isle Royale is located in Lake Superior. Isle Royale is home to populations of wolves and moose. The interactions between the wolves and moose, as well as the individualpopulation sizes, have been studied since The graph shows the population sizes over time for both wolves and moose.Isle Royale is located in Lake Superior. Isle Royale is home to populations of wolvesand moose. The interactions between the wolves and moose, as well as the individualpopulation sizes, have been studied since The graph shows the population sizesover time for both wolves and moose.Describe one limiting factor for the moose population.Thursday 11/1/12
4Friday 11/2/12Explain one likely reason why the wolf population rapidly increased between 1975 and 1980.
5Wednesday 11/7/12Predict what will happen to the moose population’s size after 1994 by describing the shape of the curve. In your answer, be sure to explain the reasoning behind your prediction.The student response correctly describes one of the limiting factors for moose on the island, logicallyexplains that an increase in wolf population indicates an ample food supply for the wolves, and correctlypredicts the shape of the curve and logically explains why the moose population might change after 1994.
6Thursday 11/8/12The diagram models how a poison bonds to the active site of an enzyme. Which function is the enzyme most likely unable to perform because of the attachment of the poison molecule?A. the release of stored chemical energyB. the donation of electrons to the substrateC. the supply of activation energy for a reactionD. the catalysis of the reaction with the substrateD. Key: Most enzymes react with only one reactant, so when a poison blocks the acti ve site, the enzyme can no longer bond with the substrate, causing the chemical reacti on to stop.
7Friday 11/9/12The graph shows how the activity of an enzyme changes at different temperatures.Which statement best describes what happens to the enzyme when the temperature of the reaction increases to 63°C?A. The enzyme is used up and the reaction stops.B. The enzyme begins to decrease the rate of the reaction.C. The enzyme continues to increase the rate of the reaction.D. The enzyme changes shape and can no longer speed up the reaction.D. Key: Enzymes have an opti mal temperature range at which they functi on; when the temperature exceeds that range, the enzyme will denature, causing it to change its shape and no longer be able to bind with the substrate.
8Monday 11/12/12A scientist formed Chemical X in a laboratory. The material was then analyzed by otherscientists.Molecular StructureAnalysis showed that the chemical was composed of long chains of repeated copies ofCH2 molecules.104831A.4.1.19. A researcher noticed that a similar CH2 molecular structure was also located inthe plasma membrane of an animal cell. This CH2 molecular structure contained anegatively charged phosphate group. Which statement best describes the primaryfunction of the CH2 and phosphate molecular structure located in the plasmamembrane?A. It contains the genetic information needed for protein production.B. It catalyzes specifi c chemical reactions in the cytoplasm of a cell.C. It stores the energy that a cell needs to perform various life processes.D. It allows a cell to regulate the movement of materials into and out of a cell.
9Tuesday 11/13/12Which type of organic molecule was most likely formed by the scientist in the laboratory?A. lipidB. proteinC. nucleic acidD. carbohydrate
10Wednesday 11/14/12Proteins are a major part of every living cell and have many different functions within each cell.Describe the general composition of a protein molecule.
11Thursday 11/15/12Carbohydrates also perform numerous roles in living things.Describe how the structures of proteins differ from the structures of carbohydrates.
12Friday 11/16/12Describe how the functions of proteins differ from the functions of carbohydrates.
13Monday 11/ 19 Students’ Observations of a Pond Ecosystem Quantitative Qualitative37 fish and 3 frogs Leaves lie on the bottom of the pond.2 types of aquatic grass Water insects move along the water’s surface.12 small rocks and 1 medium rock All 3 frogs are sitting on a pond bank.A group of students measured a ten-square-meter section of a pond ecosystem and recorded observations. Which statement is a testable hypothesis?A. The frogs living in the pond represent a population.B. Water is an abiotic component in the pond ecosystem.C. If the fish are given more food, then they will be happier.D. If the frogs are startled, then they will jump into the water.
1411/20/12 TuesdayWhy might growth slow from an exponential rate in a population of sheep?(A) Disease(B) Lack of space(C) Wolves(D) All of the above(E) None of the above
1511/21/12 WednesdayWhat is a relationship in which two organisms both benefit from their association?(A) Symbiosis(B) Mutualism(C) Commensalism(D) Parasitism(E) Competition
1611/27/12 TuesdayWhy is energy lost as it moves from producers to primary consumers?(A) Saprophytic activity(B) Biomass decreases(C) Secondary consumers eat primary consumers(D) Respiration and metabolic activity(E) None of the above
1711/ 28/ 12 WednesdayWhich of the following organisms participate in the nitrogen cycle?(A) Denitrifying bacteria(B) Chemosynthetic bacteria(C) Saprophytes(D) All of the above(E) None of the above
18Thursday 11/29/12Which of the following releases carbon dioxide into the atmosphere?(A) Animal consumption of producers(B) Photosynthesis(C) Chemosynthesis(D) Bacterial decay(E) None of the above
19Monday 12/3A species of snapping turtles has a tongue that resembles a worm. The tongue is used to attract small fish. Which best describes the interaction between the fish and the snapping turtle?A. predationB. symbiosisC. parasitismD. competition
2012/4/12 TuesdayIn a plains community, the population with greatest biomass would be(A) hawks(B) foxes(C) prairie dogs(D) grasses(E) beetles
2112/5 WednesdayWhich sequence correctly describes the flow of energy between organisms in a marine food web? sealpenguin sea birdsmall fish whalekrillA. from seals to penguins to krillB. from whales to krill to small fishC. from sea birds to seals to penguinsD. from small fish to penguins to seals
2212/6 ThursdayWhich statement correctly describes how nitrogen in the soil returns to the atmosphere?A. soil bacteria convert nitrates into nitrogen gasB. Decomposers directly convert ammonium into nitrogen gasC. Plants assimilate nitrites & convert them into nitrogen gasD. Nitrogen fixing bacteria in plant roots convert nitrates into nitrogen gas.
2312/7 FridayAgricultural runoff can carry fertilizers into lakes & streams. This runoff can cause algae populations to increase. Which effect does this change in the algae population sizes most likely have on affected lakes & streams?A. increase in water levelB. increase in water clarityC. reduction in dissolved oxygen needed by fishD. reduction in temperature variations near the water’s surface
24Monday 12/10If the flow of energy in an Arctic ecosystem goes through a simple food chain from seaweeds to fish to seals to polar bears, then which of the following is TRUE?A. Polar bears can provide more food for Eskimos than seals can.B. The total energy content of the seaweeds is l lower than that of the seals.C. Polar bear meat probably contains the highest concentrations of fat-soluble toxins.D. Seals are more numerous than fish.E. The carnivores can provide more food for the Eskimos than the herbivores can.
25Tuesday 12/11All of the following are likely results of land-clearing operations such as deforestation and agricultural activity EXCEPT:A. Destruction of plant and animal habitats.B. Erosion of soil due to increased water runoff.C.Leaching of minerals from the soil.D.Rapid eutrophication of streams and lakes.E.Decreased carbon dioxide in the atmosphere.
2612/12 WednesdayHuman use of prokaryotic organisms to help detoxify a polluted wetland would be an example of:A. Ecosystem augmentation.B. Keystone species introduction.C. Biological control.D. Bioremediation.E. Population viability analysis.
2712/13 Thursday Which species is the producer? The diagram below represents a food web for a particular terrestrial ecosystem. Each letter is a species. The arrows represent energy flow. Answer the following questions concerning this figure.Which species is the producer?
2812/14 FridayThe diagram below represents a food web for a particular terrestrial ecosystem. Each letter is a species. The arrows represent energy flow. Answer the following questions concerning this figure.Which species is most likely the decomposer?
2912/17 MondayThe diagram below represents a food web for a particular terrestrial ecosystem. Each letter is a species. The arrows represent energy flow. Answer the following questions concerning this figure.A toxic pollutant would probably reach its highest concentration in which species?
3012/18 TuesdayThe diagram below represents a food web for a particular terrestrial ecosystem. Each letter is a species. The arrows represent energy flow. Answer the following questions concerning this figure.Excluding the decomposer, biomass would probably be smallest for which species?
3112/19 WednesdayA typical pyramid of energy has a broad base tapering to a narrow top. The primary reason for this pattern is that:A. Secondary consumers require less energy than producers.B. At each step, energy is lost from the system as a result of keeping the organisms alive.C. As materials pass through ecosystems, some of them are lost to the environment.D. Biomagnification of toxic materials limits the secondary and tertiary consumers.E. Secondary consumers have a more general diet than primary producers.
3212/20 ThursdayWhich of the following statements about the ozone layer are true:A. The ozone layer has been eroded by the release of chloroflourocarbons.B. The ozone layer is thinnest at the equator.C. Ozone caused by automobile emissions is slowly replacing lost ozone at higher atmospheres.D. The release of pollutants from manufacturing sources had destroyed the ozone layer directly over major industrial centers.E. Deforestation and "slash and burn" land clearing are responsible for most of the ozone layer depletion seen today.
331/2 WednesdayDifferentiate between a food chain and a food web. Which is more likely to exist in nature?
34Which characteristic is shared by all prokaryotes & eukaryotes? 1/3 ThursdayWhich characteristic is shared by all prokaryotes & eukaryotes?A. ability to store hereditary infoB. use of organelles to control cell processesC. use of cellular respiration for energy releaseD. ability to move in response to environmental stimuli
351/4 FridayWhich statement best describes an effect of the low density of frozen water in a lake?A. When water freezes, it contracts, decreasing the water level in a lake.B. Water in a lake freezes from the bottom up, killing most aquatic animals.C. When water in a lake freezes, it floats, providing insulation for organisms below.D. Water removes thermal energy from the land around a lake, causing the lake to freeze.
361/7 MondayWhich statement best describes a difference between prokaryotic cells and eukaryotic cells?A. The presence of both DNA and ribosomes in prokaryotic cells indicates that they are more complex than eukaryotic cells.B. The larger size of prokaryotic cells indicates that they are more complex than eukaryotic cells.C. The presence of membrane-bound organelles in eukaryotic cells indicates that they are more complex than prokaryotic cells.D. The larger size of eukaryotic cells indicates that they are more complex than prokaryotic cells.
371/8 TuesdayWhich component of this membrane contains a hydrophobic region and acts as the primary barrier to most foreign substances?A. proteinB. cholesterolC. carbohydrate chainD. phospholipid bilayer
381/9 WednesdayScientists observed that the populations of top-level consumers in a particular ecosystem were rapidly decreasing. Further studies revealed that there was also a decline in producer productivity. Which other changes did the scientists most likely observe in the ecosystem?A. increased producer diversityB. decreased population size at all levelsC. decreased primary consumer populations onlyD. increased primary and secondary consumer diversity
391/10 ThursdayThe structure found in ALL cells that encloses a cell from the outside is the ______.A. CytosolB. Cell wallC. Endoplasmic ReticulumD. Cell membrane
401/11 FridayDue to having less items in the cell, and less complex, ________ are usually smallerA. ProkaryotesB. EukaryotesC. BothD. Neither
411/14 Monday The function of the nucleus is to: A. make the cell bigger B. make proteinsC. surround and protect the cellD. surround and protect DNA
421/15 TuesdayWhich of the following correctly matches a cell part with its function?A. mitochondria...photosynthesisB. nucleus...make ATPC. vesicle/vacuole...storageD. lysosome...movement
431/16 WednesdayThis cell barrier refers to the "fluid mosaic mode" and is highly selective about what passes throughA. gap junctionB. cell wallC. nuclear membraneD. cell membrane
441/17 Thursday The diffusion of water across a membrane is known as: A. facilitated diffusionB. active transportC. osmosisD. diffusion
451/18 FridayLiving organisms can be classified as prokaryotes or eukaryotes. Which two structures are common to both prokaryotic and eukaryotic cells?A. Cell wall and nucleusB. Cell wall and chloroplastC. plasma membrane and nucleusD. plasma membrane and cytoplasm
50Which statement best compares the energy transformations of photosynthesis and cellular respiration?A. Only photosynthesis uses oxygen to create energy.B. Only photosynthesis causes an increase in kinetic energy.C. Photosynthesis and cellular respiration both store energy in chemical bonds. *D. Photosynthesis and cellular respiration both require chemical energy to make food.
51Tail length in mice varies within a population Tail length in mice varies within a population. Scientists observed change in thedistribution of tail lengths in a mouse population over time. At the genetic level,what has most likely happened to the allele for the shortest tail lengths?A. The allele changed from being dominant to being recessive.B. The allele changed from being autosomal to being sex-linked.C. The allele became less frequent than the alleles for longer tail lengths.D. The allele began to code for long tail lengths instead of the shortest ones.