Answer the following statements true (T) or false (F)
1.During development, bone becomes progressively more calcified and hardened.
2.An individual skeletal muscle is separated from others by the connective tissue sheath which wraps it.
3.The basic job of skeletal muscle is to pump blood through the body.
4.When a motor neuron stimulates a muscle fiber, the fiber contracts.
5.The membrane of a muscle cell makes a deeply indented set of B tubules where a motor neuron contacts it.
1.TRUE
2.TRUE
3.FALSE
4.TRUE
5.FALSE
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Which of the following is an example of the
result of a beneficial mutation?
a. A new digestive enzyme that is better at digesting cellulose. b. A new digestive enzyme that is equal in its ability to digest cellulose as the existing enzyme. c. A new digestive enzyme that is less effective at digesting cellulose. d. A new protein that interferes with the digestive process. e. A new protein that has no function
Which of the following is (are) an important
influence(s) on the evolution of mammals? a. continental movements b. geographic isolation c. competition between species d. decline of the dinosaurs e. all of these
A coelom
A. is located between the outer body wall and the gut. B. filled with air. C. only found in vertebrates. D. All of these answers are true.
Pheromones have the ability to modify reproductive behaviors in some animals
Indicate whether the statement is true or false