If the liver cells of an animal have 24 chromosomes, how many chromosomes do its sperm cells have?
A) 6
B) 12
C) 24
D) 48 E) 64
Answer: B) 12
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Ethylene oxide is gas that
A. is very useful for sterilizing heat or moisture-sensitive items. B. is potentially carcinogenic. C. is used as a 37% aqueous solution. D. is effective against all microorganisms except endospores and viruses. E. is very useful for sterilizing heat or moisture-sensitive items AND is potentially carcinogenic.
Microorganisms require large quantities of ______ for use in cell structure and metabolism.
A. water B. trace elements C. growth factors D. electrolytes E. macronutrients
In contrast to predation, a parasite usually ____
a. does not kill its host b. always kills its host c. is a short-term visitor d. is larger than its host e. does not harm its host
Which of the following elements is most likely to carry a +1 charge in its ionic state?
A. Silicon B. Barium C. Argon D. Nitrogen E. Potassium