The hormone ____ is involved in a positive feedback cycle that results in strong uterine contractions during labor.
A. estrogen
B. oxytocin
C. cortisol
D. progesterone
E. prolactin
Answer: B
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Which of the following is NOT related to genetic drift?
A. Founder effect. B. Bottleneck effect. C. Sexual selection. D. Both the founder effect and the bottleneck effect. E. Both sexual selection and bottleneck effect.
Which of the following is found in eukaryotic cells but not in bacterial cells?
A. Endoplasmic reticulum B. Lysosomes C. Mitochondria D. Nucleus E. All of the choices are correct.
To avoid sinking the purple sea snail
a. uses jet propulsion from the mantle to move upward. b. has wings on its foot for swimming. c. has gas vacuoles in its shell. d. produces a bubble raft surrounded by mucus. e. fills its liver with low-density oil.
What serves as a pressure release valve for the force of the air waves passing through the cochlea?
a. eustachian tube b. oval window c. tympanic membrane d. round window e. auditory nerve