Which of the following types of contraception is the least effective?
A. RU486
B. the rhythm method
C. condoms
D. birth control pills
E. All of these contraceptive methods are equally effective
B. the rhythm method
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True-breeding red flowers are crossed with true-breeding white flowers, and all of the offspring are pink. What kind of inheritance is this?
a. codominance b. polyploidy c. incomplete dominance d. homozygous recessive
ADH is also called vasopressin. What functions of vasopressin make this an appropriate name for this hormone?
What will be an ideal response?
Down syndrome involves trisomy
a. 3. b. 5. c. 15. d. 19. e. 21.
In the knee-jerk reflex arc, the synapse between a sensory neuron and a motor neuron occurs where?
a. in the brain b. between the receptor and the spinal cord c. within the muscle of the leg d. within the spinal cord e. in the nerve leading to the spinal cord