________ and ________ are the two kinds of sugars found in bacterial cell walls.
Fill in the blank(s) with the appropriate word(s).
N-acetylglucosamine (GlcNAc); N-acetylmuramic acid (MurNAc)
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Other than the molecules they express, what is the difference between a CD4+ and an CD8+ T cell?
a. When activated, a CD8+ T cell becomes a helper T cell, and a CD4+ T cell becomes a cytotoxic T lymphocyte. b. Stimulated CD8+ T cells are implicated heavily in allergic reactions, and CD4+ T cells are not. c. When activated, a CD4+ T cell becomes a helper T cell, and a CD8+ T cell becomes a cytotoxic T lymphocyte. d. Both are naïve cells, but only CD4+ T cells can differentiate when stimulated.
This image shows an area in which a glacier has melted. What is indicated by the number “2”?
a. competition for food resources b. resource partitioning between two competing species c. emergence of climax species d. colonization by pioneer species e. secondary succession
The pH of the adult vagina is acidic due to the conversion of ________ to ________ by bacteria
A) glucose; ethanol B) protein; acetic acid C) glycogen; lactic acid D) mucosal cells; lactic acid E) urine; lactic acid
Which lobe of the cerebrum is a processing center for vision?
a. parietal b. occipital c. temporal d. frontal e. ganglional