What is the significance of the industrial practice of waiting for cultures to enter the stationary phase of growth before harvest?
A. The cells are at peak metabolic activity.
B. Secondary metabolites are often the desired product, and are only produced in stationary phase.
C. The desired primary metabolites are produced in stationary phase.
D. Potential toxins from log phase growth have been depleted.
E. An optimal combination of primary and secondary metabolites is being produced.
Answer: B
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Carbon dioxide, which is a breakdown product of the pesticide, is likely used by the bacteria
for which of the following?
a. an energy source b. cell structure c. to carry genetic information d. both an energy source and cell structure
The process by which cells break down nutrients to produce ATP is known as ____
a. anabolism b. dehydration synthesis c. glycolysis d. cellular respiration e. ATP activation
Which of the following statements concerning glial cells is true?
a. Astrocytes are phagocytic cells that remove debris in the central nervous system. b. Schwann cells form sheaths around neurons within the central nervous system. c. Oligodendrocytes regulate the concentration of neurotransmitters in neurons. d. Microglia are involved in the neurological disease multiple sclerosis. e. Ependymal cells help produce and circulate cerebrospinal fluid.
A(n) (autotroph/lithotroph/organotroph) uses inorganic molecules as electron donors.
Fill in the blank(s) with the appropriate word(s).