Eukaryotes are ________.
A. often made of prokaryotic cells
B. always multicellular
C. often multicellular, sometimes unicellular
D. always unicellular
Answer: C
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Cartilaginous fish (chondrichthyes):
A. have well-developed kidneys. B. may have teeth made of bone. C. are generally freshwater species. D. have a swim bladder.
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 mutation can be the cause for
A) sperm and egg formation. B) growth and development. C) sexual reproduction. D) environmental change. E) natural selection.
A chemical fuel that allows the body cells to do work and to function is known as
a. RNA b. ATP c. endocrine d. DNA e. H20