Most members of the subphylum ______ are carnivorous and have an open circulatory system in which blood is pumped into the hemocoel by a dorsal heart.
a. Chelicerata
b. Hexapoda
c. Myriapoda
d. Crustacea
d. Crustacea
Most members of the subphylum ______ are carnivorous and have an open circulatory system in which blood is pumped into the hemocoel by a dorsal heart.
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The total DNA in a cell is referred to as the:a
genome. b. cDNA. c. library. d. chromosomal DNA. e. Human Genome project
Descendant cells that are long-lived and "remember" a particular invader and mount a rapid intense response to it if it should reappear are ________
A) macrophages B) memory cells C) suppressor cells D) helper cells
A scientific theory is:
A. a suggested explanation that accounts for observations. B. a way to organize how we think about a problem. C. a way to understand a complex system by reducing it to its working parts. D. a concept that is supported by experimental evidence that explains the facts in an area of study.
Schwann cells make up the __________.
A) neurons B) myelin sheath in the CNS C) myelin sheath in the PNS D) axons E) nodes of Ranvier