1. Which of the following base pairs represents a purine? a. Uracil and Adenine b. Adenine and Thymine c. Guanine and Cytosine d. Cytosine and Uracil e. Adenine and Guanine 2. Which of the following is a density-independent factor that limits population growth of an organism? a. two species competing for the same food source b. a wildfire that rages through a forest, burning it to the ground c. snowy owls preying on arctic hares d. a disease passing through a population of pigs on a farm e. an expansion of a human community in unpopulated fields 3. Acetyl CoA is a product of what? a. Krebs cycle/citric acid cycle b. glycolysis c. electron transport chain d. Calvin cycle e. pyruvate oxidation 4. Which of the following is most true about intraspecific competition? a. It is the greatest between organisms that occupy different ecological niches b. It can be easily demonstrated to occur in natural environments c. It involves interaction between individuals of the same species d. It is the greatest between organisms that physically share similar ecological niches e. It increases with resource partitioning 5. The name of the following functional group is: a. Ketone b. Carbonyl c. Ether d. Ester e. Carboxyl R-C-R 6. Which process converts the energy in glucose into energy in the absence of oxygen outside of the human body a. alcohol fermentation b. aerobic respiration c. anaerobic respiration d. photosynthesis e. lactate fermentation 7. Match each stage of translation with its correct description. I. Initiation II. Elongation III. Termination a. the ribosome translates each codon in the sequence b. the ribosome reads the stop codon c. the ribosome binds to the start mRNA sequence 8. In which of the following places would you least expect to find anaerobic respiration occurring? a. in the sediments at the bottom of a lake b. in a vat in which beer is being manufactured c. in a sprinter's leg muscles during a 100-metre dash d. in a human brain engaged in writing an exam e. in the tissues of a tapeworm living in a human intestine 9. Which enzyme links Okazaki fragments on the lagging strand of DNA? a. Restrictive enzymes b. Helicase c. DNA Polymerase d. Primase 10. The pain felt in muscles after strenuous exercise is caused by: a. phosphocreatine b. oxidative phosphorylation c. lactic acid d. alcohol build-up e. dephosphorylation of ATP in muscle fibres 11. When the ambient room temperature is low, such as 10 Celsius, the body will lose thermal energy through which mechanism? a. radiation b. conduction c. evaporation d. decreased metabolism 2