Answer the following questions true (T) or false (F)
1. It is desirable for a classification system to be based on the evolutionary history of the organisms being studied.
2. The earliest evidence of life on Earth dates to about 3.8 billion years ago.
3. The metabolism-first model suggests that a self-replicating RNA molecule was responsible for driving the evolution of the first forms of life.
1. TRUE
2. TRUE
3. FALSE
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The refractory period of a neuronal plasma membrane is important because it ____
a. establishes the resting potential b. initiates an action potential c. ensures that the threshold potential will be reached d. ensures that an impulse will travel in a one-way direction e. resets the threshold potential
What are the benefits of using animals in research?
What will be an ideal response?
A period of mass extinction is often followed by ________
A) explosive diversification B) paedomorphosis C) global warming D) continental drift
Which of the following is true of microbes?
a. 99% of all microbes are pathogenic. b. All bacterial enzymes are harmful to humans and the environment. c. Gene expression in bacteria is very similar to gene expression in humans, which facilitates the use of bacteria in recombinant biotechnology and gene therapy. d. Microbes create pollutants and toxins that harm the environment.