During S phase, each chromatid is copied, forming

What will be an ideal response?


sister chromatids.

Biology & Microbiology

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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.

Biology & Microbiology

A rigid cell wall made of chitin surrounds the cells of most fungi

1.True 2.False

Biology & Microbiology

Which is the largest, most diverse group of arthropods?

a. crustaceans b. centipedes c. arachnids d. insects e. millipedes

Biology & Microbiology

The oldest fossils to be designated Homo sapiens are the Cro-Magnons.

Answer the following statement true (T) or false (F)

Biology & Microbiology