Which of these methods can be used to determine the number of viable microorganisms in a sample?
A. Light scattering in a spectrophotometer
B. Counting a known volume of cells in a hemocytometer
C. Measuring colony forming units per ml
D. Measuring total cell mass
Answer: C
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The epithelial tissue of animal cells is most similar to the ________ of plant cells?
A. ground B. dermal C. xylem D. vascular E. phloem
Where is most the Earth’s phosphate found?
a. ocean water b. aquifers c. the atmosphere d. rocks and sediments e. plants
A behavior that occurs immediately after birth, before any encounter with another member of the same species, is
A) not under genetic control. B) learned. C) innate. D) nonadaptive. E) based on habituation.
A sperm whale in the middle of the Atlantic Ocean is in which oceanic zone?
A) intertidal B) benthic C) pelagic D) estuarine