2015年5月IB生物SL真题下载-Paper1

2015年5月IB生物SL真题下载-Paper1

1. A frog jumped 80 times and each time the length of the jump was recorded. The mean length of the jumps was 38 cm with a standard deviation of 10 cm. What can be deduced from this information?

A. The frog did not jump more than 48 cm.

B. The number of jumps more than 38 cm is the same as the number less than 38 cm.

C. Approximately 32 % of the jumps were less than 28 cm.

D. Approximately 68 % of the jumps were between 28 and 48 cm.

 

2. Which functions of life are carried out by all unicellular organisms?

A. Response, homeostasis, growth and photosynthesis

B. Metabolism, ventilation, reproduction and nutrition

C. Response, homeostasis, metabolism and growth

D. Reproduction, ventilation, response and nutrition

 

3. A botanist measures a leaf and finds it is 24 cm long and 8 cm wide. His drawing of the leaf is 4 cm wide. Which was the magnification and length of his drawing, assuming that the proportions of the drawing were correct?

4. What is the structure labeled X in the electron micrograph of a rat liver cell?

A. Ribosome

B. Lysosome

C. Mitochondrion

D. Nucleus

 

5. What is a role of protein pumps in active transport?

A. To control whether specific substances enter the cell

B. To move substances across a concentration gradient

C. To produce ATP for energy

D. To provide protein for facilitated diffusion

 

6. Which events occur during both mitosis and meiosis?

A. Production of haploid cells from diploid cells

B. Crossing over

C. Separation of the chromatids from each chromosome

D. Production of genetically different cells

 

7. What property of water makes it suitable as a coolant?

A. It takes a lot of energy to increase the temperature of water.

B. It takes a lot of energy for water to evaporate.

C. Water molecules are cohesive and stick to the skin.

D. Water is a good solvent so it can transport heat from the body.

 

8. What are these molecules?

9. Molecules A and B are amino acids and C is a dipeptide. Which reaction represents a condensation reaction?

A.  A + B + H2O→C

B.  A + B→C +H2O

C.  C +H2O→ A + B

D.  C→ A + B +H2O

 

10. What is a difference between carbohydrates and lipids in energy storage?

A. Carbohydrates are used for long term storage and lipids for short term storage.

B. Carbohydrates contain more energy per 100 g than lipids.

C. Carbohydrates are more easily transported to where energy is required than lipids.

D. Carbohydrates store food only in plants whereas lipids store food in plants and animals.

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