Regents Living Environment Test Preparation Practice

    Regents Test, Full Exam Practice Online: living environment June 2012

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    Base your answers to questions 31 and 32 on the information below and on your knowledge of biology.

    Diabetes is a condition characterized by elevated blood sugar levels. One form of diabetes occurs when insulin fails to properly regulate blood sugar levels. Complications from diabetes can include nerve cell damage and poor blood flow, especially in the feet and legs. In individuals with diabetes, wounds usually take longer than normal to heal.

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    Base your answers to questions 34 and 35 on the diagram below and on your knowledge of biology. The letters in the diagram indicate structures present in a human male.

    reproduction and development, human male reproductive system fig: lenv62012-exam_w_g12.png

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    Base your answers to questions 38 and 39 on the diagram below and on your knowledge of biology. The diagram represents the reproductive cycle of a squirrel species with 40 chromosomes in each zygote.

    reproduction and development, defferentiation and embryonic development fig: lenv62012-exam_w_g15.png

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    Base your answers to questions 41 through 43 on the diagram below and on your knowledge of biology. The diagram represents an energy pyramid for an ecosystem in the Australian outback.

    ecology, energy flow and food web fig: lenv62012-exam_w_g17.png

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    Base your answers to questions 44 through 48 on the information and data table below and on your knowledge of biology.

    Daphnia (water fleas) are sensitive to many changes in pond ecosystems. For this reason they are often used in bioassays, tests in which organisms are exposed to various levels of a chemical to determine what levels are safe. The results of these tests determine whether or not the chemical being tested will affect other pond organisms.

    An experiment was designed to determine the toxicity of different salt solutions on cultures of daphnia. Five fish tanks were each filled with the same amount of water containing different concentrations of salt. Ten daphnia were placed into each tank. After 48 hours, the number of daphnia that had survived and the number of daphnia that had died in each tank were recorded and the percent mortality was calculated. The results of the experiment are shown in the data table below.

    scientific inquiry, data organization, plot and interpretation fig: lenv62012-exam_w_g19.png

    Directions: Using the information in the data table, construct a line graph on the grid on the next page, following the directions below.

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    Base your answers to questions 49 through 51 on the information below and on your knowledge of biology.

    Beware of Dust Mites

    Quietly lurking within our mattresses, under our beds, and inside sofas and carpets are creatures too small to be seen with- out a microscope. Dust mites are arthropods closely related to spiders, scorpions, and ticks. They feed on the dead skin cells regularly shed by humans and their animal pets. The average human sheds about 10 grams of dead skin a week. Cats and dogs create even more dander for dust mites to eat. The mites also eat pollen, fungi, and bacteria. They do not drink water but absorb it from the air.

    Dust mites do not carry diseases and are harmless to most people. It’s their bathroom habits that make some of us itch and sneeze. Many people develop severe allergies to dust mite feces

    homeostasis and immunity, imbalance in homeostasis and diseases, allergic reactions fig: lenv62012-exam_w_g21.png

    (wastes). If you lie on a rug where dust mites live, you might develop itchy red bumps on your skin. Breathe in dust containing their feces and you might have more serious symptoms, such as difficulty breathing or a severe asthma attack.

    Dust mites thrive in warm, humid environments — eating and nesting in dust-collecting bedding, fabric, and carpet. Think about this! A typical mattress can contain anywhere from 100,000 to 10 million dust mites. Nearly 100,000 dust mites can live in one square yard of carpet.

    During a process called sensitization, a person’s immune system mistakenly identifies the inhaled dust mite waste as an invader. The next time the person is exposed to the dust mite waste, the immune system launches an allergic reaction.

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    Base your answers to questions 54 and 55 on the information and graph below and on your knowledge of biology. The graph contains information about an ecosystem.

    The graph below shows the carrying capacities of an ecosystem for three different species, 1, 2, and 3, that inhabit an area and the actual population sizes of these three different species in the area.

    ecology, materials cycle through ecosystems fig: lenv62012-exam_w_g24.png

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    Base your answers to questions 56 through 60 on the information below and on your knowledge of biology.

    A chemical known as fertex affects external fertilization of sea urchin eggs. An experi- ment was set up using three tanks to investigate the effect of fertex. Each tank had a different concentration of fertex: 1%, 2%, and 3%. Ten sea urchin eggs and 2 mL of sea urchin sperm were added to each of the three tanks. A fourth tank was set up as a control.

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    Base your answer to question 61-63 on the information below and on your knowledge of biology.

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    Base your answer to question 66-68 on the information below and on your knowledge of biology.

    Officials OK Insect Release To Control Invasive Vine

    The U.S. federal government has approved the release of a non-indigenous [nonnative] insect on Guam and in the Northern Marianas to control the rapid spread of a vine that is covering forests like a blanket, the Saipan Tribune reports.

    The U.S. Department of Agriculture has given the green light to breed and release the Heteropsylla spinulosa insect, which eats the Mimosa dilotricha [diplotricha] vine. The fast- spreading plant is found in many Pacific Islands, but is particularly widespread in the Northern Marianas and on Guam. It usually kills the trees and shrubs that it covers.

    Officials will collect the insect from Pohnpei, in the Federated States of Micronesia, Palau and Australia.

    Source: “Officials OK Insect Release To Control Invasive Vine,” 4/2/08,

    www.saipantribune.com

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    Base your answer to question 69-72 on the information below and on your knowledge of biology.

    Chickens as Drug Factories

    Scientists in Scotland have successfully produced five generations of chickens that lay eggs containing certain protein-based drugs. The scientists changed the DNA of the chickens so that two drugs, one used to treat skin cancer and the other used to treat multiple sclerosis, were present in the egg whites. Cows, sheep, and goats have already been altered to produce protein-based drugs in their milk. Chickens are considered good “drug factories” because they are inexpensive to care for, they grow fast, and their chicks inherit the special drug-producing ability.

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    Base your answers to questions 75 through 77 on the diagram below and on your knowledge of biology.

    labs, lab, the beaks of finches fig: lenv62012-exam_w_g27.png

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    Base your answers to questions 78 and 79 on the information below and on your knowledge of biology.

    An artificial cell filled with a glucose solution was placed in a beaker of water, as represented below. The beaker was left undisturbed for 20 minutes.

    labs, lab, diffusion through a membrane fig: lenv62012-exam_w_g30.png

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    Base your answers to questions 83 through 85 on the Universal Genetic Code Chart below and on your knowledge of biology.

    labs, lab, relationships and biodiversity fig: lenv62012-exam_w_g31.png

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