The developing sperm cells arising from a single primary spermatocyte remain joined by cytoplasmic bridges until development is complete so that a Y-bearing sperm can be provided with essential products coded for by the X chromosome
Indicate whether the statement is true or false
T
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The inability of the immune system to protect the body from a pathogen causes
a) immunodeficiency diseases b) allergy c) autoimmune disease d) transplantations e) graft
A lack of ATP in a contracted skeletal muscle cell would most likely cause
a. cross bridges to detach from actin b. the sarcomeres to remain shortened c. an inability to relax d. both a and c e. both b and c
The neurilemma of axons in the peripheral nervous system is formed by
A) astrocytes. B) satellite cells. C) oligodendrocytes. D) microglia. E) Schwann cells.
The female climacteric refers to the
A. cessation of menstruation. B. time from the onset of irregular menstrual cycles to cessation of those cycles. C. decrease in the sexual drive. D. inability to have sexual intercourse. E. PMS.