1. The lengths of a sample of tiger canines were measured. 68 % of the lengths fell within a range between 15 mm and 45 mm. The mean was 30 mm. What is the standard deviation of this sample?

A. 5 mm

B. 15 mm

C. 7.5 mm

D. 30 mm


2. Which functions of life are found in all unicellular organisms?

A. growth, response and nutrition

B. differentiation, response and nutrition

C. metabolism, meiosis and homeostasis

D. growth, metabolism and differentiation


3. Which statement is part of the cell theory?

A. Cells are composed of organic molecules.

B. Cells have DNA as their genetic material.

C. Cells have cytoplasm surrounded by a membrane.

D. Cells come from pre-existing cells.


4. Which of the following are features of prokaryotes and eukaryotes?

5. What route is used to export proteins from the cell?

A. Golgi apparatus → rough endoplasmic reticulum → plasma membrane

B. Rough endoplasmic reticulum → Golgi apparatus → plasma membrane

C. Golgi apparatus → lysosome → rough endoplasmic reticulum

D. Rough endoplasmic reticulum → lysosome → Golgi apparatus


6. Which events occur during the G1 phase and S phase of the cell cycle?

7. Which substance in prokaryotes contains sulfur?


B. Phospholipids

C. Proteins

D. Antibiotics


8. Which describes these molecules correctly?

9. What sequence of processes is carried out by the structure labelled X during translation?

A. Combining with an amino acid and then binding to an anticodon

B. Binding to an anticodon and then combining with an amino acid

C. Binding to a codon and then combining with an amino acid

D. Combining with an amino acid and then binding to a codon


10. The diagram below shows a biochemical pathway in a yeast cell. Which of the following correctly identifies a compound in the diagram?

A. I is fat.

B. II is pyruvate.

C. III is lactate.

D. IV is carbon dioxide




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