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3. Cholesterol levels are measured for a random sample of 1,000 persons. The survey is repeated for the same population, but with the sample size tripled to 3,000. Which one […]

2. Fish spend a lot of energy removing oxygen from water. Which one of the following is the most plausible reason? a. The CO2 content of their tissues is much […]

1. A researcher observes a moth that is highly attracted to a particular species of flower. The researcher wants to determine if smell is an important factor in this attraction. […]

15. Which of the following can be reasonably inferred based on this phylogeny of four species? a. The ancestral species at the root of the tree most closely resembles A […]

14. In a purification experiment, a mixture of 3 proteins A, B and C are separated through gel exclusion or cation exchange chromatography. During elution, the buffer used is of […]

13. We are studying a protein-coding gene in an organism whose genome is not sequenced. The nucleotide sequence of 20 bases at the 5’ end of its 900 base exon […]

12. In a sucrose density gradient, what is the order of organelle sedimentation from lower to higher concentrations of sucrose? a. Golgi, smooth endoplasmic reticulum, rough endoplasmic reticulum b. smooth […]

11. In resting skeletal muscle, contraction does not occur because a. there is very little ATP in the cytoplasm b. there is very little myosin in the cell c. there […]

10. Bacteria isolated from hospital surfaces (e.g. furniture or floors) are often very resistant to antibiotics. What features of bacterial biology promote this phenomenon? a. Bacterial cells are very small […]

9. A mutation in an X-chromosome gene “green” results in a green beard. If a green bearded man marries a non-carrier woman, a. all sons will have a green beard […]