Which of the following best illustrates ecological succession?
a. overgrazing causes a nutrient loss from soil
b. grass grows on a sand dune, is replaced by shrubs, and then by trees
c. introduced pheasants increase, and native quail populations disappear
d. decomposition in soil releases nitrogen that plants can use
e. a mouse eats seeds, and an owl eats the mouse
Answer: b. grass grows on a sand dune, is replaced by shrubs, and then by trees
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At the center of the iris is the _________
Fill in the blank(s) with the appropriate word(s).
The ureters drain urine into the
(a) renal pelvis. (b) cecum. (c) urinary bladder. (d) small intestine.
The polymerization of different types of macromolecules is similar in many respects. Which of the following principles below is least likely to be common to all methods of polymerization of macromolecules?
A) To be added to the polymer, the monomer must be activated. B) Macromolecules are synthesized by the addition of monomers. C) The polymer is directional. D) Polymerization is passive, requiring little ATP. E) As monomers are added to the polymer, water is removed from the macromolecule.
The process of crossover is best defined as genetic recombination that occurs between ________.
a. non-sister homologous chromatids in meiotic prophase I b. sister chromatids in meiotic prophase II c. non-sister chromatids in meiotic prophase II d. sister chromatids in meiotic prophase I