What advantage do ferns have over bryophytes?
A. Ferns photosynthesize
B. Ferns are heterotrophs.
C. Ferns have a vascular system, which allow them to grow taller.
D. Ferns do not require water to reproduce.
E. Ferns have alternation of generations.
Answer: C. Ferns have a vascular system, which allow them to grow taller.
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Which organ system is NOT required for the maintenance of homeostasis within an organism?
a. excretory system b. reproductive system c. skeletal system d. endocrine system e. lymphatic system
How does radiometric dating work?
1.Cooling of molten rock produces particular mineral structures that can be used to determine when a crystal formed. 2.Radioisotope decay speeds up over time, so a graph can be made to predict the date. 3.Although ratios of atoms cannot be determined precisely, their half-lives can be used to predict an approximate date that a crystal formed. 4.Fossils older than 60,000 years can only be dated using carbon 14 since all other atoms will have decayed since then.
When the blood level of calcium falls below normal, which hormone stimulates osteoclasts to break
down bone and release calcium? a. growth hormone b. thyroid hormone c. calcitonin d. thyroid hormone e. PTH
What does it mean when an enzyme is saturated?
a. It means the enzymes need more reactants. b. It means the enzymes have sufficient reactants available for optimal activity. c. It means the enzymes cannot continue to catalyze the reaction. d. It means the reaction is at equilibrium.