Diagram and label the life cycle of a fern. Be sure to identify the gametophyte and sporophyte generations. What will be an ideal response?
The diagram should resemble Figure 27-16 in the text.
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A brief reversal of the electric gradient across
the plasma membrane is called
a. a threshold potential. b. an action potential. c. a reverse potential. d. a resting potential. e. an ionic potential
What is the function of Taq polymerase?
A) to denature DNA so its strands separate B) to bond to complementary DNA C) to free nucleotides from a DNA strand D) to use primers to initiate DNA synthesis
____ are NOT composed of membranes.
A. Golgi apparatus B. Microtubules C. Mitochondria D. Endoplasmic reticulum
Answer the following statements true (T) or false (F)
1. You would expect to find more mitochondria in glycolytic muscle fibers than in oxidative muscle fibers. 2. When a person "works out" with weights, their muscles typically grow. This growth is due to increases in the number of myofibrils within their muscle fibers. 3. When Ron Evans generated transgenic mice in which the gene PPAR-delta was constituitively active (i.e., always expressed), he found that these mice showed a shift from fast glycolytic fibers to slow oxidative fibers. Based on this, you would also predict faster sprint speeds in the transgenic mice. 4. Muscles that extend a limb at a joint are termed "extensors."