Why is an antigenic shift in a virus so dangerous?
A. It alters the virus in such a way that our immune system doesn't know how to combat it.
B. It combines the deadliest features of another virus into its genetic makeup.
C. The disease mutates into an entirely new form.
D. It weakens our immune system.
Ans: A. It alters the virus in such a way that our immune system doesn't know how to combat it.
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Prokaryotes have traditionally been classified by numerical taxonomy, which compares all of the following traits except ________
a. shape b. gene sequencing c. cell wall properties d. metabolism
Based on the endosymbiosis theory that highlights where chloroplasts come from, how would you expect chloroplasts to divide when a plant cell divides?
A. Via mitosis B. Via meiosis C. Via endosymbiosis D. Via binary fission
Which of the following statements concerning Down syndrome is FALSE?
a. Down syndrome involves nondisjunction. b. Down syndrome individuals have 47 chromosomes per somatic cell. c. Down syndrome incidence increases with increasing material age. d. Down syndrome individuals have an extra chromosome 22. e. Down syndrome is variable in expression.
Choose the correct match of glial cell type and function
A) astrocytes — metabolize neurotransmitters and modulate synaptic effectiveness B) oligodendrocytes — produce the myelin sheaths of myelinated neurons in the peripheral nervous system C) radial glia — the source of immunoprotection against pathogens D) Schwann cells — provide nutritional support to non-myelinated neurons