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8. A bag contains 8 square and 3 spherical objects, and two objects are drawn one after another. If the first drawn object is put back in the bag before […]

7. Which of the following viruses has been linked to microcephaly? a. Yellow fever b. Zika c. Dengue d. Japanese encephalitis Zika virus is the one linked to microcephaly among […]

6. Which of the following is not a necessary feature of a reflex action a. It is mediated by the nervous system b. It is involuntary c. It serves a […]

5. In radiocarbon dating, scientists base their estimates of the age of a sample on the measured counts per minute per gram of carbon (cpm/g-C). The half-life of carbon-14 is […]

4. The relative percentage of oxygen in the air remains constant at 21%, from sea level to the peak of Mt. Everest. Why then do humans suffer from altitude sickness? […]

3. I hold a bottle vertically, looking down at its cap. To open the bottle I rotate the cap clockwise. This means the thread of the screw on which the […]

2. The use of DNA evidence to find crime suspects is not perfectly conclusive because of a. degradation of the sample b. contamination by other individuals’ DNA c. insufficient data […]

1. In 1828, Wohler synthesized urea in the laboratory. This was significant because it demonstrated that: a. biomolecules are carbon compounds b. urea would be an ideal fertilizer c. organic […]

15. Rank the following ideas/discoveries from oldest to most recent. (I) DNA is the molecule responsible for heredity (II) Living things best suited to their environment are more likely to […]

14. Despite humans having a highly evolved immune system, pathogens are able to evade the immune system using various strategies. Which of the following immune evasion strategies cannot be employed […]