How many checkpoints occur during interphase prior to a cell entering mitosis?
a. one
b. two
c. three
d. four
B
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Transpiration is best defined as:
A. the evaporative loss of water through the stomata. B. the movement of water in the xylem. C. the movement of water from the air into the plant. D. the movement of water into the stomata. E. the evaporative loss of CO2 through the stomata.
Answer the following statements true (T) or false (F)
1. Two species of three-spined stickleback fish live in a single lake in British Columbia. They are closely related but occupy different niches. They exist nowhere else. These species most likely arose by sympatric speciation from a single species of three-spined stickleback. 2. The pace of evolution may change due to sudden environmental shifts such as climate change. This may result in rapid evolution. 3. The Mexican axolotl (Ambystoma mexicanum) is an amphibian that has a derived mode of development characterized by metamorphic failure. This mode of development results in an entirely aquatic life cycle in which the animal never develops a terrestrial phase. This is an example of paedomorphosis. 4. A modern goal of systematics is to create taxa based on similarity of form and function, regardless of evolutionary relationships. 5. An assumption used for molecular clocks is that neutral mutations accumulate at a rapidly increasing rate over time between two species.
Which of the following are considered reservoirs of infection?
A) carriers B) contaminated food and drinking water C) rabid animals D) all of the above
The process of DNA replication is conservative
__________________ Indicate whether the statement is true or false.