How does a cell typically know when to divide?
A. Proto-oncogenes code for growth factor proteins that initiate cell division.
B. Cells have an internal clock and divide only when they reach a certain age.
C. Tumor suppressor genes code for growth factor proteins that initiate cell division.
D. Oncogenes code for growth factor proteins that initiate cell division.
Answer: A
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Consider the positive feedback regulating mammalian childbirth. In this process, the pituitary gland is _________, oxytocin is __________, and a uterine contraction is __________
A. the sensor; the effector; both the stimulus and response B. the effector; the sensor; both the stimulus and response C. both the stimulus and response; the effector; the sensor D. both the stimulus and response; the sensor; the effector
Define the terms producer, primary consumer, and secondary consumer.
What will be an ideal response?
Oceans and the tropical rain forests contribute equally to global productivity
Indicate whether the statement is true or false.
Select all of the layers of the digestive system wall.
A. Submucosa B. Serosa C. mucosa D. muscularis