During S phase, each chromatid is copied, forming
What will be an ideal response?
sister chromatids.
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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.
A rigid cell wall made of chitin surrounds the cells of most fungi
1.True 2.False
Which is the largest, most diverse group of arthropods?
a. crustaceans b. centipedes c. arachnids d. insects e. millipedes
The oldest fossils to be designated Homo sapiens are the Cro-Magnons.
Answer the following statement true (T) or false (F)