The sexual reproduction of earthworms characteristically is
A. hermaphroditic but cross-fertilizing.
B. hermaphroditic but self-fertilizing.
C. normal type between individuals who remain as males and females throughout their life time.
D. normal appearing, but individuals change sex periodically.
E. normal appearing, but individuals reproduce only once in their lives.
A. hermaphroditic but cross-fertilizing.
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The primary function of the large intestine is to
A. emulsify fats. B. reabsorb water and other secretions. C. absorb food molecules. D. produce digestive juices.
Which of the following methods is best for counting fecal bacteria from a stream to determine the safety of the water for drinking?
a. dry weight b. turbidity c. viable plate count d. membrane filtration
Cations are
A. atoms without protons. B. charged subatomic particles. C. atoms that have gained electrons. D. radioactive isotopes. E. capable of forming ionic bonds with anions.
The symptoms of diphtheria are due to an exotoxin that blocks proteins synthesis in host cells
Indicate whether the statement is true or false