3rd Quarter Practice Packet - answers.doc - 3rd Quarter...

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3 rd Quarter PracTce Packet DUE FRIDAY A± ±HE LA±ES± 1. A student transfers a protozoan from a marine (saltwater) culture to a drop of fresh (pure) water on a microscope slide. While observing the slide, the student noTces that the protozoan (single celled organism) begins to swell. ±he student quickly transfers the organism into a drop of salt water and the protozoan returns to normal. What process explains the student’s observaTons? A. acTve transport B. osmosis C. endocytosis D. exocytosis 2. Which of the following are anaerobic (no O 2 present) processes of cellular respiraTon? 3. What two structures are found in a plant cell that are NO± found in an animal cell? 4. A student measured the temperature outside her classroom every hour starTng a 9:00 am and ending at 3:00 pm. Her measurements are in the table to the right. ±he student wants to grow a culture of yeast. ±he opTmum (best) temperature for yeast growth is between 27 C and 31 C . If it takes 5 hours for yeast to grow, when should the student begin her culture? 5. A food chain in a prairie ecosystem contains four components: grass, mice, snakes, and hawks. If a snake represents 580 Joules of energy, esTmate how much energy is represented by the grass in this ecosystem? A. 0.058 Joules B. 58 Joules C. 5800 Joules D. 58000 Joules 6. A strand of mRNA contains 36 nucleoTdes. A nucleoTde is made up of a sugar, a phosphate, and a nitrogen base. ±hree nitrogen bases make up a codon on a mRNA strand. If one codon codes for one amino acid, how many amino acids are there on the protein created by this mRNA strand? 7. During which phase of Mitosis are the sister chromaTds pulled to opposite ends of the cell? 8. Which of the following happens in Meiosis I but NO± in Meiosis II? 9. Joseph Lister hypothesized that disease did not spontaneously happen, but rather that microorganisms caused disease. He tried to prevent disease by keeping his surgery germ free in 1869. Lister recorded his data in the chart to the right. Did data from the experiment support Lister’s hypothesis?
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