Which of the following is a concept of the cell theory?
A) Cells are the basic structural unit of life.
B) Tissues are the site of control.
C) Organelles are the basic functional unit of life.
D) Cells are produced by meiosis.
E) Cells are immortal.
A) Cells are the basic structural unit of life.
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If the gonads fail to develop very early during human development, the contributions of which germ layer may be deficient?
A) epiderm B) ectoderm C) periderm D) endoderm E) mesoderm
Among the extant vertebrates, only the bony fishes (Osteichthyes) possess bone
(a) Why, then, do we make the assumption that the ancestors of cartilaginous fishes must have had bone that was subsequently lost? (b) Why don't we think this is true for the lampreys and hagfishes?
Which of the following is not a lymphocyte?
A) NK cells B) plasma cells C) memory T cells D) macrophages E) suppressor T cells
The ventricles of the vertebrate brain contain
A) Neurons. B) Glia. C) Cerebrospinal fluid. D) Dura mater.