Dallas ISD Science Department $ 20 $ 30 $ 40 $ 50 $ 10 $ 20 $ 30 $ 40 $ 50 $ 10 $ 20 $ 30 $ 40 $ 50 $ 10 $ 20 $ 30 $ 40 $ 50 $ 10 Cells and Viruses Ecosystem Evolution Flow of Matter and Energy

Dallas ISD Science Department Which of the following factors helps spread disease-causing bacteria? F Low temperatures G Access to new hosts H Mutation by heat energy J Availability of light

Dallas ISD Science Department G Access to new hosts

Dallas ISD Science Department Viruses differ from bacteria in that all viruses — F cause insect-borne diseases G can be destroyed by antibiotics H have rigid cell walls J must be reproduced in living cells

Dallas ISD Science Department J must be reproduced in living cells

Dallas ISD Science Department Some bacteria thrive in hostile environments, such as salt flats, boiling-hot springs, and carbonate- rock interiors, primarily because of bacteria’s — F biochemical diversity G small sizes H round shapes J methods of movement

Dallas ISD Science Department F biochemical diversity

Dallas ISD Science Department Bacteria that grow in the presence of the antibiotic, penicillin, develop holes in their cell walls. Which of the following explains why penicillin is effective against some bacteria? A.Water enters the holes in these bacteria and causes osmotic rupture. B. Penicillin causes the flagella to become inactive. C. The pili of the bacteria puncture the penicillin. D. Penicillin produces oxygen, which kills any kind of bacteria.

Dallas ISD Science Department A. Water enters the holes in these bacteria and causes osmotic rupture.

Dallas ISD Science Department Clostridium tetani are anaerobes that produce a powerful nerve toxin that causes the often fatal disease called tetanus. C. tetani are found on nearly every surface. Unless a person has a current immunization (shot) against tetanus, deep puncture wounds can be fatal. Why? A. C. tetani can live with or without oxygen. B. Puncture wounds don’t allow air to enter, preventing oxygen in the air from killing the C. tetani. C. C. tetani have no flagella and thus cannot move away from the wound. D. C. tetani only form as diplococci.

Dallas ISD Science Department A. C. tetani can live with or without oxygen.

Dallas ISD Science Department Beechdrops (Epifagus virginiana) are leafless plants that lack chlorophyll. Beechdrops get their nourishment from the roots of beech trees, which reduces the amount of nutrients available to the trees themselves. This interaction is best described as — A predatory B parasitic C commensalistic D mutualistic

Dallas ISD Science Department B parasitic

Dallas ISD Science Department Species of the genus Toxicodendron, which includes poison ivy and poison oak, produce a gummy oil that causes a severe itchy rash in some animals. This substance is part of the Toxicodendron species’— F defense mechanisms G nutritional processes H support system J clinging ability

Dallas ISD Science Department F defense mechanisms

Dallas ISD Science Department Which situation best represents a mutualistic relationship? A A tapeworm absorbing nutrients from the intestine of a dog B An orchid being pollinated by a nectar- collecting wasp C A human losing blood to a feeding mosquito D An armadillo rooting in the soil at the base of an oak tree

Dallas ISD Science Department B An orchid being pollinated by a nectar- collecting wasp

Dallas ISD Science Department The table lists four groups of factors found in a particular ecosystem. Which group consists of only abiotic factors? F Group 1 G Group 2 H Group 3 J Group 4

Dallas ISD Science Department H Group 3

Dallas ISD Science Department Which of these conclusions can be made based on the graphs shown? A Larger mosquitoes have migrated into the area. B Smaller mosquitoes are being eaten by larger mosquitoes. C A mosquito length of 2 cm has become a disadvantage in this environment. D Mosquitoes with a body length of 3 cm have the longest life span.

Dallas ISD Science Department C A mosquito length of 2 cm has become a disadvantage in this environment.

Dallas ISD Science Department Which of the following leaf types is most likely to help a plant survive in an arid habitat?

Dallas ISD Science Department

Dolphins and fish are unrelated vertebrates with similar body shapes that are adapted for moving efficiently through water. What evolutionary process is shown by this example? A. Divergent evolution B. Convergent evolution C. Reproductive isolation D. Polyploid speciation

Dallas ISD Science Department B. Convergent evolution

Dallas ISD Science Department An albino animal has white skin and hair and pink eyes. How can this variation be harmful to an organism? A.It prevents the organism from mating. B.Lack of pigment exposes the animal to dangerous rays from the Sun. C.It prevents the animal from making its own food. D.Lack of pigment results in geographical isolation from other animals in the species.

Dallas ISD Science Department A. Lack of pigment exposes the animal to dangerous rays from the Sun.

Dallas ISD Science Department According to the diagram, how have elephants changed over the past 55 million years? A.Their ears have become enlarged and their bodies have gotten smaller. B.Their trunks have become longer and their legs have become shorter. C.Their bodies have become larger and their trunks have become longer. D.Their tusks have become longer and their ears have become larger.

Dallas ISD Science Department C. Their bodies have become larger and their trunks have become longer.

Dallas ISD Science Department The table shows an amino acid comparison of cytochrome c, a protein involved in cellular respiration in aerobic organisms. The two organisms in the table that are least genetically related are the — A silkworm moth and the fruit fly B silkworm moth and the screwworm fly C fruit fly and the screwworm fly D fruit fly and the hornworm moth

Dallas ISD Science Department B silkworm moth and the screwworm fly

Dallas ISD Science Department Which of the following terms are NOT related? A.Water cycle—precipitation B.Nitrogen cycle—nitrogen fixation C.Phosphorus cycle—evaporation D.Carbon cycle—photosynthesis

Dallas ISD Science Department C. Phosphorus cycle—evaporation

Dallas ISD Science Department In this food web, the bacteria probably function as — A producers B herbivores C decomposers D carnivores

Dallas ISD Science Department C decomposers

Dallas ISD Science Department Based on what you’ve learned about the cycling of materials through ecosystems, predict which material would most likely be added to a chemical fertilizer to increase soil productivity. A.H 2 O B.CO 2 C.N 2 D. NO 3

Dallas ISD Science Department D NO 3

Dallas ISD Science Department A food pyramid represents the relative amount of energy in trophic levels. Which of the following correctly shows a food pyramid?

Dallas ISD Science Department

The graph shows levels of atmospheric carbon dioxide over the past 250 years. Which statement best summarizes the trend shown in the graph? A. Levels of CO2 are rising. B. Levels of CO2 are decreasing. C. Levels of CO2 have remained the same. D. Levels of CO2 are fluctuating, but no pattern exists.

Dallas ISD Science Department A. Levels of CO 2 are rising.