Which of the following cells is a component of the body's first line defense?
A. monocyte
B. goblet cell
C. NK cell
D. neutrophil
E. microglial cells
Answer: B
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Molecular barcodes are:
A. barcodes stamped on vegetables in the supermarket to indicate freshness B. DNA sequences used to identify and catalog biodiversity C. radioactively labeled genes used to detect horizontal transfer of genes D. genetic inversions used to detect crossovers E. All of the choices provided are incorrect.
The maintenance of a constant internal environment is
A. positive feedback. B. negative feedback. C. homeostasis. D. positive regulation.
Host specificity of a virus is due to
A) particular genes that it shares with the infected cell. B) the presence of an envelope. C) differences in size between the virus and the host cell. D) the presence or absence of a cell wall on the host cell. E) interactions between viral and cellular surface molecules.
All the mass of an atom is considered to be in the:
A) protons and neutrons. B) electrons only. C) protons, neutrons, and electrons. D) protons only.