Which brain defense restricts substances from entering the brain via the vascular system?
A. Blood-brain barrier
B. Cranium
C. Meninges
D. Microglia
E. Macrophages
Answer: A
Biology & Microbiology
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Homologous chromosomes have the same arrangement of genes along their length
A. true B. false
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Briefly explain why children born with severe combined immune deficiency (SCID) often do not experience infection for several months after birth
What will be an ideal response?
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A compound that dissociates in water to produce ________ is called a salt
A) hydrogen ions B) anions C) hydroxyl ions D) cations E) anions and cations
Biology & Microbiology
Substances that cannot be broken down into other substances are called _________.
A. neutrons B. elements C. protons D. compounds
Biology & Microbiology