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

Biology & Microbiology

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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

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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

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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

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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.

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