2011年5月IB生物SL真题下载-Paper1
1. The table below shows the level of hemoglobin measured in two different groups of athletes.
Which of the following statements is correct?
A. Results from group B are more accurate because more athletes were tested.
B. Results from group B are more reliable because it has a higher standard deviation.
C. More athletes have their hemoglobin concentration close to the mean in group A than in group B.
D. These results indicate that the level of hemoglobin follows a normal distribution.
2. Which of the following will contribute to the cell theory?
- I. Living organisms are composed of cells.
- II. All cells come from pre-existing cells by mitosis.
- III. Cells are the smallest units of life.
A. I only
B. II only
C. I and III only
D. I, II and III
3. A red blood cell is 8 μm in diameter. If drawn 100 times larger than its actual size, what diameter will the drawing be in mm?
A. 0.08 mm
B. 0.8 mm
C. 8 mm
D. 80 mm
4. A cell has cytoplasm, a cell wall, naked DNA and ribosomes. Based on this information, what type of cell could this be?
A. A cell from a pine tree
B. A grasshopper cell
C. A human red blood cell
D. A bacterium
5. What do diffusion and osmosis have in common?
A. They only happen in living cells.
B. They require transport proteins in the membrane.
C. They are passive transport mechanisms.
D. Net movement of substances is against the concentration gradient.
6. The diagram below shows a cell during mitosis.
7. Which of the following are connected by hydrogen bonds?
A. Hydrogen to oxygen within a molecule of water
B. Phosphate to sugar in a DNA molecule
C. Base to sugar in a DNA molecule
D. Hydrogen to oxygen between two different molecules of water.
8. The graph below shows the effect of substrate concentration on enzyme activity. What conclusion can be drawn about section X of the graph?
A. The enzyme has started to denature and the reaction slows down.
B. The reaction has finished and the substrate has been used up.
C. The enzyme is saturated and is working at its maximum reaction rate.
D. Some of the enzyme has been consumed and the reaction has reached a plateau.
9. Which type of molecule is shown in the diagram below?
A. Peptide
B. Carbohydrate
C. Lipid
D. Nucleic acid
10. The percentage of thymine in the DNA of an organism is approximately 30 %. What is the percentage of guanine?
A. 70 %
B. 30 %
C. 40 %
D. 20 %
2011年5月IB生物SL真题余下省略！
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