The "cuddle hormone," secreted in greater quantities following sexual contact, is
a. testosterone.
b. estrogen.
c. follicle stimulating hormone.
d. melatonin.
e. oxytocin.
E
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Which of the following statements is true?
A. Tracheids are multicellular conduits, whereas vessels are unicellular conduits. B. Tracheids transport water, whereas vessels transport sugars. C. Tracheids are short and thin, whereas vessel elements are much wider. D. Tracheids compose the xylem, and vessel elements compose the phloem. E. Water enters tracheids through pits, whereas water enters vessels only through spaces between the cells.
Insulin and glucagon exhibit which type of hormone interaction?
a. synergistic b. permissive c. opposing d. unrelating e. mutual
If two genes are almost always found in the same gamete,
a. they are located close together on the same chromosome. b. they are located on nonhomologous chromosomes. c. they are located far apart on the same chromosome. d. they are found on the sex chromosome. e. they are found on the autosome.