1999 AP Bio - BIOLOGY SECTION 1 Time- 1 hour and 30 minutes...

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BIOLOGY SECTION 1 Time- 1 hour and 30 minutes Directions: Each of the questions or incomplete statements below is followed by five suggested answers or completions. Select the one that is best in each case and then fill in the corresponding oval on the answer sheet. 1. Which point on the curve in the diagram above best represents the carrying capacity of the environment for the population shown? (A) A (B) B (C) C (D) D (E) E 2. Assume that genes A and B are not linked. If the probability of allele A in a gamete is 1/2 and the probability of allele B in a gamete is 1/2, then the probability that both A and B are in the same gamete is (A) 1/2 x 1/2 (B) 1/2 + 1/2 (C) 1/2 / 1/2 (D) (1/2) 1/2 (E) |1/2 – 1/2| 3. A couple has five children, all sons. If the woman gives birth to a sixth child, what is the probability that the sixth child will be a son? (A) 5/6 (B) 1/2 (C) 1/5 (D) 1/6 (E) 1/64 4. All of the following are true about the Earth’s ozone layer EXCEPT: (A) It shields Earth from most ultraviolet radiation. (B) It is composed of O 3 (C) Its thickness has remained constant over time. (D) CFC (chlorofluocarbon) molecules can destroy ozone molecules.
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(E) It is predicted that a reduction of this layer will result in an increase in human skin cancer. 5. Which of the following organelles modifies and packages for secretion the materials produced by the ribosomes? (A) the chloroplast (B) the Golgi apparatus (C) the nucleus (D) the nucleolus (E) the mitochondrion 6. Which of the following types of behavior describes the way that mice find their way through mazes? (A) habituation (B) imprinting (C) reasoning (D) instinct (E) trial and error 7. A student using a light microscope observes a cell and correctly decides that it is a plant cell because (A) ribosomes are visible (B) an endoplasmic reticulum can be seen (C) a cell membrane is present (D) it has a large central vacuole (E) centrioles are present 8. The condition in which there are barriers to successful interbreeding between individuals of different species in the same community is referred to as (A) Latent variations (B) Sterility (C) Structural differences (D) Geographic isolation (E) Reproductive isolation 9. Which of the following best describes the parents in a testcross? (A) One individual has the dominant phenotype and the other has the recessive phenotype. (B) Both individuals are heterozygous. (C) Both individuals have the dominant phenotype. (D) Both individuals have the recessive phenotype. (E) Both individuals have an unknown phenotype. 10. Members of which of the following are the major primary producers in the marine ecosystem? (A) Yeasts (B) Sponges (C) Sporozoans (D) Fshes (E) Diatoms 11. In sheep, eye color is controlled by a single gene with two alleles. When a homozygous brown-eyed sheep is crossed wit ha homozygous green-eyed sheep,
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blue-eyed offspring are produced. If the blue-eyed sheep are mated with each other, what percent of the offspring will most likely have brown eyes? (A) 0%
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1999 AP Bio - BIOLOGY SECTION 1 Time- 1 hour and 30 minutes...

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