In arthropods, locomotion is accomplished by muscles that work against
A. each other.
B. mineralized bones.
C. a hydrostatic skeleton.
D. the exoskeleton.
E. the pseudocoel.
Answer: D
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Human stem cells are valuable in drug development because they can be used to
A) create experimental organisms, such as rats and mice. B) replace experimental animals such as rats and mice. C) grow human embryos in culture, on which drugs can be tested. D) study the latest stages of the disease that would have unfolded if the person hadn't died.
If nondisjunction occurs during meiosis,
a. the resulting sex cells will be heterogametes. b. one-half of the resulting cells will exhibit trisomy and the other half monosomy. c. diploid cells will be produced. d. all gametes would lack a chromosome and these gametes would be infertile. e. none of the gametes will be capable of achieving fertilization.
The fusion of male and female gametes usually occurs in the upper third of the vagina. Indicate whether the statement is true or false
The change of the pattern of gene expression without changing the nucleotide sequence of DNA is
termed _________________. Fill in the blank(s) with the appropriate word(s).