Living Environment - January 2011


Part B–1 - Answer all questions in this part.

31 Activities in the human body are represented in the diagram below.

Which title would be appropriate for the diagram?

(1) Rate of Excretion Varies in Response to Amount of Water Taken In
(2) Feedback Mechanisms Help to Maintain Homeostasis
(3) Respiratory Rate Responds to an Increase in Muscle Activity
(4) The Nervous System Responds to Changes in Blood Sugar Levels

32 A company that manufactures a popular multivitamin wanted to determine whether their multivitamin had any side effects. For its initial study, the company chose 2000 individuals to take one of their multivitamin tablets per day for one year. Scientists from the company surveyed the participants to determine whether they had experienced any side effects. The greatest problem with this procedure is that

(1) only one brand of vitamin was tested
(2) the study lasted only one year
(3) the sample size was not large enough
(4) no control group was used

33 In a particular ecosystem, squirrels make up a large portion of the diet of coyotes. A fatal disease in the squirrel population begins to reduce their population over a period of months. Which graph best represents the expected changes in population size of the coyotes and the squirrels?

34 Which statement would most likely be used to describe the procedure represented in the diagram below?

(1) Enzymes are used to assemble an insulin gene, which is then attached to bacterial DNA.
(2) Bacterial DNA is cut from a human DNA strand and inserted into a human cell to form an insulin gene.
(3) The insulin gene is cut out of a human DNA strand using an enzyme and inserted into bacterial DNA, resulting in a combination of different DNA segments.
(4) A gene is deleted from bacterial DNA to produce an insulin gene, which is then inserted into human DNA.

35 Part of a molecule found in cells is represented below.

Which process is most directly affected by the arrangement of components 1 through 4?

(1) diffusion through cell membranes
(2) fertilization of a sex cell
(3) sequencing of amino acids in cells
(4) increasing the number of cells in an organism

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