Given a log phase bacterial culture with 1 x 106 cells per ml and a generation time of 30 minutes, how long does it take the culture to reach a density of 6.4 × 107 cells per ml?
A. 4 hours
B. 3 hours
C. 2 hours
D. 1 hour
Answer: B
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Which of the following is produced by adding 1% to 5% agar to nutrient broth that is then boiled and cooled?
A. A contaminated medium B. A liquid medium C. A pure culture D. A mixed culture E. A solid medium
Which of the following animals would have access to the most oxygen in its environment?
a. a termite living in its underground nest b. a snow leopard living high in the Himalayan mountains c. a zebra living close to sea level d. a deep-sea ray
What molecule contributes to the red color of slow-twitch muscle fibers?
A. myoglobin B. ATP C. glycogen D. lactic acid E. fatty acids
All of the following traits are consistent with evolution by sexual selection EXCEPT ____
a. males are larger than females b. females actively choose superior males c. males often bear showy or defensive structures d. males gather and defend harems of females e. gametes are dispersed into the environment by wind or water