When a cell binds a signal molecule, it may affect ____
a. gene activity
b. protein synthesis
c. cell division
d. secretion
e. all of these
E
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The act of nursing stimulates the contraction of smooth muscle cells in the breast. If a newborn infant is unable to nurse, then
A. progesterone secretion is not inhibited. B. milk is not produced. C. oxytocin is not secreted. D. prolactin is not secreted. E. prostaglandins are not secreted.
The nervous system is to the ectoderm as the skeleton is to the
A. allantois. B. chorion. C. endoderm. D. blastula. E. mesoderm.
What is the structure that holds the chromatids together?
A) centromere B) chromatin C) chromosomes D) karyotype E) none of these
Who proposed that in any DNA molecule, A =T and G = C?
A. Franklin B. Chargaff C. Watson and Crick D. Hershey and Chase