Acetylcholine released into the junction between a motor neuron and a skeletal muscle binds to a sodium channel and opens it. This is an example of _____
A) a voltage-gated sodium channel
B) a voltage-gated potassium channel
C) a ligand-gated sodium channel
D) a second-messenger-gated sodium channel
E) a chemical that inhibits action potentials
Answer: C
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Answer the following statements true (T) or false (F)
1. During gastrulation, muscle cells and connective tissues are formed from the endoderm. 2. Sand dollars, a kind of marine echinoderm, release their gametes into the surrounding water to be fertilized through spawning, producing large numbers of offspring. They do not care for their young, many of which are eaten by predators. Therefore, this organism exhibits a type III survivorship curve. 3. A graph of a typical exponential growth curve will be J-shaped, as exhibited in the early growth pattern of bacteria. 4. The chance of survival of an individual sparrow during an unusually hot summer is independent of that species’ population density. 5. Economic development in a country can change its population’s age structure to a conical shape.
While on a hike in the forest, you notice that some trees have leaves with small brown spots of dead tissue on some leaves. You suspect that the levels of ____ must be high in these cells
a. abscisic acid b. hydrogen peroxide and nitric oxide c. ethylene d. jasmonic acid e. epicatechin
How does the removal of prairie dogs differ from the removal of any other animal species? a. Removal of prairie dogs fundamentally changed the community from one with high speciesdiversity to one dominated by mesquite and grasses
b. Removal of prairie dogs allowed for a more diverse community structure to becomeestablished. c. Removal of all other species had only a temporary effect on other populations. d. Both a and c above .
fiber helps to prevent what
What will be an ideal response?