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BIOLOGY ElM TEST FOR BOTH BIOLOGY-E AND BIOLOGY -M, ANSWER QUESTIONS 1-60 Directions: Each set of lettered choices below refers to the numbered questions or statements immediately following it Select the one le.ttered chQice that best answers each question or best fits each statement and then fill in the corre~ sponding circle on the answer sheet A choice may be used once, more than once, or not at all in each set Questions 1-4 refer to the following plant cell types.

BIOLOGY-ElM TEST-Continued Questions 11-14 refer to the following illustration of protein synthesis in a mammalian cell.

Questions 15-17

BIOLOGY·EIM TEST-Continued Directions: Each of the questions or incomplete statements below is followed by five suggested answers or completions. Some questions pertain to a set that refers to a laboratory or experimental situation. For each question, select the one choice that is the best answer to the question and then fill in the corresponding circle on the answer sheet. 18. The ribosomes of a cell are of primary impOrtance for Unauthorized copying or _ of any part of.thls page II Illegal. t234

BIOLOGY -ElM TEST-Continued 23. Which of the following statements is true for red blood cells that have been added to a flask of saturated NaCl solution? 2 24. Today's worldwide human population can best be . described as , I (A) oscillating 3 7 (B) declining

BIOLOGY;.E/M TEST-Continued 27. In the fruit fly, the allele for normal wings (W) is dominant over the allele for vestigial wings (w). A cross of two normal-Winged flies produced 76 normal-winged and 23 vestigial-winged off­ spring. It can be concluded that the genotypes of the two parent flies were which of the following?

BIOLOGY -FJM TEST-Continued 31. Which of the following statements is correct?

BIOLOGY -ElM TEST-Continued 38. The diagram above illustrates a proposed phylogeny for horses. Which of the following genera is currently represented by live animals? Unauthorized COPYing or reuse of any part of this page Is Illegal. t238

BIOLOGY -ElM TEST-Continued 39. Which of the following organelles in human sperm provides the energy needed by the sperm? v ~ Metaphase Telophase 41. Most replication of DNA takes place during which. of the following stages of the cell cycle?

BIOLOGY ·EIM TEST -Continued 42. Which of the following is a biotic factor that can " make a major contribution to the regulation of a population in a given community?

BIOLOGY -ElM TEST-Continued Questions 47-48 A population study of plants was done in an abandoned field. Each year for 3 years the veg~tation was sampled .. The chart below indicates the results of the study. Year Number of Plants per Acre 1 2 3. Sandspur 3,800 1,500 752 .. Ragweed 4,900 2,209 180 Timothy Grass 600 1,185 2,234 Goldenrod 0 75 790 Wire Grass 412 796 1,643 47. According to th~ data. which of the following are initially most suCcessful in the succession taking place in the field described above? .

BIOLOGY·EIM TEST -Continued Questions 49·51 The figure below represents the increase in prevalence of both keratoses (thickened pigmented patches on the skin) and skin cancers in males of Irish descent in several geographic areas. 60r-~---r--~------~ O~~~~~--~----~ 30 40 50 60 70 Age (years) -- Keratoses ---. Skin Cancers 49. For which of the following groups can 20 percent of the male population be expected to have the indicated condition?

NO TEST MATERIAL ON THIS PAGE 243t

BIOLOGY·EIM TEST-Continued Questions 52-55 Charles Darwin and his son Francis performed a series of experiments on phototropism (growth toward light) of the coleoptile' (the cap that covers the fIrst leaves of new seedlings of grass). The treatments they used are described below~ ·~8 I II ------/ I IV v VI Treatment Growth Toward Light I, Coleoptile untreated. Allowed . II Tip of coleoptile cut off. Prevented m Opaque Cap placed over coleoptile tip. Prevented IV Coleoptile cut halfway through. . Allowed . V Transparent cap placed over coleoptile tip. Allowed VI, Opaque sleeve placed over base of coleoptile .. Allowed 52. Comparison of treatments I and II shows which of the following? -(A) Growth is promoted by cutting off the tip.

BIOLOGY·FJM TEST -Continued. 54, Comparison of treatments m, V, and VI shows that

•• BIOLOGY·EIM TEST -Continued Questions 56-60 During normal development of the sea urchin, the egg divides once to give two cells. Each of these cells divides again. The cells continue to divide and, eventually, a sea-urchin larva is formed. IUs P9ssible to separate the cells of a young sea~urchin embryo and allow them to develop independently. The results of several such experiments are . shown below. Normal Development - - 0-. ­ fertilized two-cell four-cell eight-cell sea-urchin egg embryo embryo embryo larva Experiments: Separate the cells and allow development to proceed. I •"'- IT o t t • ••• -~ ~ ~ ++ c!3c!3 56. Experiment I suggests that

BIOLOGY·F1M TEST-Continued 58. Experiments ill and IV together suggest that

BIOLOGY·E TEST Directions: Each of the questions or incomplete statements below is followed by five suggested answers or completions. Some questions pertain to.a set that refers to a laboratory or experimental situation. For each question, select the one choice that is the best answer to the question and then fiU in the corresponding circle on the answer sheet. 61. Stream and river ecosystems differ from other aquatic ecosystems because streams and rivers (A) move continuously in one direction and have a nutrient content that is dependent on location . . '(B) support a greater diversity of aquatic plants Unauthorized copying or reuM of . any part of this page Is IlJegaI • • 248

BIOLOGY·E TEST-Continued Sparrow 67. The term "adaptive radiation" refers to the Spider / /yOOg A Rosebush 65. In the food web shown above, in which the arrows indicate the direction of energy flow, the ladybug is considered to be a .

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BIOLOGY -E TEST-Continued 70. Since both species of barnacles have free­ swimining larvae that settle on hard surfaces, the change in the distribution of Chthamalus observed 3 months after removal of the larger Balanus individuals could best be explained by which of the following? (A) Balanus feeds on Chthamalus larvae.

BIOLOGY -E TEST -Continued Questions 73-75 refer to the following experiment in which an agar petri dish was prepared as shown below. Using aseptic techniques, an experiinenter spread E. coli.bacteria on the agar uniformly throughout the dish. The dish was then incubated at 37°C for 24 hours. I Nutrient Agar --+- ..... Nutrient Agar --~ ..... with Penicillin IT 73. Which of the following distributions of bacterial colonies is most likely to be observed on completion of the experiment? (Dots represent bacterial colonies.) (A) (B) I I IT (C) (D) I I (E) I Unauthorized copying or reuse of IGOONTOTHE NEXT PAGE> . any part of this page Is Illegal. t252

BIOLOGY -E TEST-. Continued 74. The cells that survived exposure to penicillin were . most likely able to do so because they

BIOLOGY -E TEST-Continued Questions 76-80 A scientist studied a field that had been burned in a brushfire ten years before. She identified seven different species and produced the table below. Scientific Name GrossFonn Microscopic Form StemFonn Color Reproduction Platismartia glauca sheetlike eukaryotic and prokaryotic filaments not applicable green on top white below none evident Funaria americana cushionlike eukaryotic multicellular not applicable green throughout spore-producing structures on stalks Dryopteris spinulos a roots, under­ ground stems, compound leaves eukaryotic multicellular fleshy green leaves, white stem and toots spores on underside of leaves Picea rubens roots, stems, needlelike leaves eukaryotic multicellular erect, woody green leaves, brown stem and roots cones Smilax herbacea roots, vine, broad leaves eukaryotic multicellular erect, herbaceous . green leaves and stem, white roots flowers Smilax rotundifolia roots, woody vine, broad leaves eukaryotic multicellular erect green l(la,ves, brown stem and roots none evident Monotiopa uniflora roots, stems, broad leaves eukaryotic multicellular erect white throughout fruits / 76. The organism that evolutionarily is mostc1o~ly 77. Symbiosis is best illustrated by which of the related to Smilax herbacea is folloy.>ing organisms?

BIOLOGY·E TEST-Continued 78. Which of the following shows the simplest level of physical Organization?

BIOLOGY-M SECTION If you are taking the Biology~M test, continue with questions 81-100. Be sure to start this section of the test by filling in circle 81 on your answer sheet. . Directions: Each of the questions or incomplete statements below is followed by five suggested answers or completions. Some questions pertain to a set that refers to a laboratory or experimental situation. For each question, select the one choice that is the best answer to the question and then fill in the corresponding circle on the answer sheet . . 0 NH+ o· _II I 3- 1 /0 C ~o-p-o'-..,../c o=c I '-o-c b- 0- II 0, ~----~yr--~--~ ~--------------~y~--------------~ I II " 81. Which of the following isCQrrect about the phospholipid shown above?

BIOLOGY·M SECTION-' Continued 82. Products of the light reactions of photosynthesis that later participate in the dark reactions of Photosynthesis include which of the following? 1. Reduced NADP (NADPH) IT. ATP m.o 2

BIOLOGY -M SECTION-Continued 88. Which of the following statements most accurately describes a basic difference between mitosis and meiosis? (A) Homologous chromosomes form tetrads in mitosis but not in meiosis. . (B) H~mologous chromosomes form tetrads in meiosis but not in mitosis.

BIOLOGY·M SECTION-Continued Questions 94-97 Bowls 1 and 7 -water only Bowls 2 and. 8 - water + 20 water plants Bowls 3 and 9 - water + 40 water plants Bowls 4 and 10- water + 2 goldfish Bowls 5 and lL-water+ .4 goldfish Bowls 6 and 12 - water + 20 water plants + 2 goldfish A biologist set up 12 bowls as described above. She exposed bowls 1 to 6 to light for 24 hours and placed bowls 7 to 12 in the dark for 24 hours. She determined the CO 2 content of the wa~r in micromoles per liter for each bowl at the end of the 24 hours. The results are indicated below. Experimental Results Light I!m:k Bowl # [COil Bowl # [COil 1 to.O 7 to.2 2 4.3 8 13.7 3 2.1 9 16.9 4 14.9 10 14.1 5 18.3 11 17.9 6 to.2 12 19.2 94. The process responsible for the relatively low concentrations of CO 2 in bowls 2 and 3is

BIOLOGY·M SECTION-Continued 98. In the electrophoresis experiment described, the distance moved by a fragment within the electric field is influenced by which of the following? I. The number of amino acids in the fragment

BIOLOGY·M SECTION-Continued Questions 98 ..100 refer to the following experimental procedure. A protein is purified from a frog embryo. The protein sample is divided into five fractions. One fraction is not treated. The other fractions are partially digested by using enzymes that act on specific amino acid sequences. In every case, the digestions are carried out at the appropriate temperature and pH. The samples are then separated by electrophoresis as shown below. Unaltered Protein Protein Protein Protein Digested'by Enzyme X Digested by EnzymeY Diges~by EnzymeZ. Unauthorized copying or reuse of IGO ON TO THE NEXT PAGE> any part of this page Is Illegal. .260