Two solutions are separated by a semipermeable membrane that is permeable to sodium but not chloride or potassium ions. Solution A on the left contains a solution that is 100 mM NaCl, while Solution B on the right has a concentration of sodium chloride of 1 mM. There is an […]

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+ […]