A study reported that high levels of phthalates
in a pregnant woman could lead to which of
the following with respect to the development
of their sons?
a. undescended testicles
b. smaller genitals
c. feminized genitals
d. all of these
e. none of these
D
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The utricle and saccule
a. each contain an organ of dynamic equilibrium. b. detect rotation of the head. c. detect how the head is oriented relative to the ground. d. are semicircular canals. e. organs use the auditory nerve to send information to the brain.
Which of the following is (are) false regarding B
cells with antigen-MHC complexes? a. They are stimulated by helper T cells to secrete cytokines. b. Helper T cells signal them to divide and differentiate. c. On signals from the helper T cells, they produce clones with identical receptors. d. Once activated by signals from helper T cells, they produce IgG, IgA, or IgE immunoglobulins instead of membrane-bound IgM. e. All of these are true.
An animal breeder asks your advice about which of a number of traits could most effectively be selected for in his herd. Which would you most correctly suggest?
A) a trait with high VE B) a high VA relative to VP C) a high VP relative to VG D) a low h2 value E) a low selection coefficient
Radioactive iodine (131I) is commonly used in medical situations for diagnosing and treating thyroid conditions. The most common isotope of iodine that is not radioactive is 127I. Chemically, what is the difference between 127I and 131I? What do they
have in common? What will be an ideal response?