Which type of bonding allows the long, straight chains of cellulose to lock together tightly?
a. hydrogen
b. polar covalent
c. ionic
d. nonpolar covalent
e. metallic
ANSWER: a
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Which genetic mechanism is most likely responsible for the evolutionary origin of new and complex plant structures,
such as flowers?
a. gene duplication b. asexual reproduction c. genes coding for flower development d. mutations in noncoding regions e. gene splicing
A thin filament of muscle is composed primarily of the protein
A. hemoglobin. B. myosin. C. myoglobin. D. actin. E. pectin.
Which of the following describes the role of urinary systems in maintaining cellular homeostasis?
A) Urinary systems filter out diseased and damaged cells that can be excreted from the body. B) Urinary systems regulate water balance, pH, and the concentrations of ions in body fluids for cells. C) Urinary systems ensure the delivery of the proper amount of nitrogen to the cells. D) Urinary systems are important for the generation of urea, which cells can use as an energy source when carbohydrates become scarce.
Organisms that are nocturnal are more likely to communicate using
A) sight and sound. B) sight and smell. C) smell and sound. D) touch and taste.