A young woman distance runner has recently not been performing well and has complained of feeling lethargic and sluggish. You perform a graded exercise test to VO2max including blood samples to attempt to determine possible cause. a. VO2max is significantly lower than measured last year. b. R value never reached […]

When I talk about the HIV to beginning biology students it is sometimes easier to say that the reverse transcriptase is unique to HIV.  However it is true that I am not presently expressing a human reverse transcriptase. a) What enzymatic activity does a reverse transcriptase perform?  b) State the […]

A three-factor cross in Salmonella typhimurium was performed using bacteriopage P22. The cross between an arg-leu-his- recipient bacterium and bacteriophage P22, which was grown on an arg+leu+his+ strain. 1000 arg+ transductants were selected and tested on several selective media by replica printing. The following results were obtained: Arg+leu-his- 583 Arg+ […]

Scientific inquiry in biology starts by observing the living species around you. What separates science from the other methods of seeking truth is that it is testable (e.g., one can devise experiments to test the validity of an idea); it is falsifiable (e.g., an experiment can reveal if an idea […]