The branch of microbiology that studies the relationship between microorganisms and their habitats is called ________ ________.
Fill in the blank(s) with the appropriate word(s).
microbial ecology
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An endocrine gland is a type of organ
A. required for remodeling bone. B. where hormones are produced and then released into the blood. C. where neuronal signals are generated. D. restricted to the production of growth factors. E. None of the choices are correct.
Some tissues need to be able to expand and contract, such as lungs during breathing and intestines during digestion. Predict which ECM protein would be abundant in these tissues.
A. Elastin B. Laminin C. Fibronectin D. Glycosaminoglycans E. Collagen
34. Pufferfish (Fugu) are a delicacy in Japan, but must be cleaned very carefully as their liver contains tetrodotoxin which blocks voltage-gated Na+ channels. Imagine you are testing for the presence of this toxin using a neuron in a dish. You apply an electrical stimulus to the neuron that should produce an action potential. What will you observe if tetrodotoxin levels are high enough to block the neuron's voltage-gated Na+ channels?
A. The neuron will exhibit a slow depolarization even before the stimulus is applied, followed by a normal action potential. B. The neuron will exhibit a slow hyperpolarization even before the stimulus is applied. C. The neuron will show a normal resting potential, but will not exhibit depolarization when the stimulus is applied. D. The neuron will exhibit rapid depolarization, but will not repolarize. E. The neuron will depolarize normally, but then become hyperpolarized such that the membrane potential is much lower than usual.
According to the fossil record, which of the following were the first vertebrates to appear on land?
A. reptiles B. mammals C. fish D. birds E. amphibians