A phagocyte is a cell that
A. engulfs other cells and debris.
B. primarily is used to produce antibodies.
C. produces white blood cells.
D. produces platelets.
E. transports oxygen to tissues.
A. engulfs other cells and debris.
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When bacteria are exposed to nutrient-poor conditions, they form thick-walled structures that contain the chromosome and a small amount of cytoplasm. These structures are called
A. plasmids. B. pseudomonads. C. nucleoids. D. endospores. E. exospores.
Which is NOT a correct association of brain structures and functions?
Select one: a. midbrain—reflex centers for visual, auditory, and tactile responses b. cerebellum—coordinates smooth and coordinated motions c. cerebrum—higher thought processes, including learning, memory, and speech d. pons—regulates breathing rate e. thalamus—regulates heartbeat and blood pressure
Ethylene has the effect of causing fruits to
A. enlarge. B. elongate. C. shrink. D. ripen. E. increase in juice content.
In a karyotype it can be seen that a homologous pair of duplicated chromosomes will contain how many chromatids?
A. one B. four C. two D. three E. six