In an EKG, what does the QRS wave indicate?
A) electrical signal over the atria B) first heart sound
C) electrical signal over the ventricles D) second heart sound
Answer: C
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Which of the following is competition between members of the same species for resources?
a. interspecific competition b. dynamic competition c. intraspecific competition d. shared governance
The number of individuals that make up a population’s gene pool is the ____
a. population distribution b. population growth c. population birth rate d. population size e. carrying capacity
Which of the following is a type of blood cell that undergoes degranulation in type I hypersensitivity reactions?
A) B cell B) basophil C) T cell D) macrophage E) plasma cell
Periplasmic flagella are unlike most flagella because they
A) move their flagella in a counter-clockwise direction. B) are located in the space between the peptidoglycan and the outer membrane. C) move their flagella in a clockwise direction. D) are located in the space between the plasma membrane and the peptidoglycan. E) have fibers that stick into the cytoplasm for a better hold.