1. A student completed a study on the height of trees of different ages. The results are shown in the following graph.

What could the vertical bars represent?

A. The median height for each age of tree

B. The value of t compared to other species of trees

C. Plus one to minus one standard deviation

D. The correlation between the height and diameter of the trees


Questions 2 and 3 refer to the following electron micrograph which shows part of two adjacent liver cells.

2. What is happening at the structure labelled X?

A. Synthesis of proteins

B. Transport of proteins to the nucleus

C. Modification of proteins prior to export

D. Secretion of proteins through the plasma membrane


3. What is the structure labelled Y?

A. Nucleus

B. Starch grain

C. Lysosome

D. Mitochondrion


4. What is proportional to a cell’s surface area?

A. Rate of exchange of materials

B. Rate of heat production

C. Rate of waste production

D. Rate of oxygen consumption


5. Which process requires channel proteins?

A. Simple diffusion

B. Facilitated diffusion

C. Binding of hormones

D. Exocytosis


6. What feature of cell membranes allows endocytosis to occur?

A. Fluidity of phospholipid bilayer

B. Presence of protein pumps

C. Presence of carrier proteins

D. Glycoprotein binding sites


7. Which element or ion is required for transmission of a nerve impulse?

A. Phosphorous

B. Sodium

C. Sulfur

D. Iron


8. Which structure represents a fatty acid?

9. The diagram shows part of a DNA molecule.

What type of bond does X represent?

A. Covalent bond

B. Hydrogen bond

C. Peptide bond

D. Semi-conservative bond


10. What will be the sequence on the mRNA molecule that is produced when the DNA base sequence ACTGATGCC is transcribed?








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