A chemical messenger from the embryo that stimulates a seed to digest the endosperm is
A. ethylene.
B. auxin.
C. abscisic acid.
D. cytokinin.
E. gibberellin.
Answer: E
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The following steps refer to various stages in transmission at a chemical synapse
1. Neurotransmitter binds with receptors associated with the postsynaptic membrane. 2. Calcium ions rush into neuron's cytoplasm. 3. An action potential depolarizes the membrane of the presynaptic axon terminal. 4. The ligand-gated ion channels open. 5. The synaptic vesicles release neurotransmitter into the synaptic cleft. Which sequence of events is correct? A) 1 ? 2 ? 3 ? 4 ? 5 B) 2 ? 3 ? 5 ? 4 ? 1 C) 3 ? 2 ? 5 ? 1 ? 4 D) 4 ? 3 ? 1 ? 2 ? 5 E) 5 ? 1 ? 2 ? 4 ? 3
When experiencing stress, the sympathetic nervous system decreases your blood pressure
Indicate whether the statement is true or false.
Bacteria and fungi secrete ________ into plant and animal tissues to break down the complex organic compounds
Fill in the blank(s) with correct word
Birds are able to sustain long flights at high altitudes because they
A) can extract oxygen during both inhalation and exhalation. B) decrease their heart rate during flight. C) use anaerobic metabolism during flight. D) have thicker blood than other animals, with many more red blood cells. E) are able to lower their body temperature during flight.