The main function of salivary mucus is to ____
a. break down starch
b. mechanically breakup food materials
c. make the food particles sticky
d. hydrate dry food particles
e. coat food particles so they slide down the esophagus
ANSWER: c
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If two solutions have unequal concentrations of a solute, the solution with the lower concentration is called
A. isotonic. B. hypertonic. C. hypotonic. D. osmosis.
When receptors coupled to phospholipase C are activated, calcium levels in the cytosol increase when ______
A. diacylglycerol binds to ligand-gated channels on the endoplasmic reticulum, releasing calcium. B. IP3 binds to ligand-gated channels on the plasma membrane, releasing calcium. C. diacylglycerol binds to ligand-gated channels on the plasma membrane, releasing calcium. D. IP3 binds to ligand-gated channels on the endoplasmic reticulum, releasing calcium. E. phospholipase C phosphorylates the receptor leading to calcium production.
Answer the following questions true (T) or false (F)
1. Currently, there are no cures or preventions for autoimmune disorders. 2. An allergen is any antigen that triggers IgE production and leads to a scenario where the immune system fights off a perceived threat that would otherwise be harmless. 3. An allergy is a scenario where the immune system fights off a perceived threat that would otherwise eventually cause the breakdown of skin or other localized tissue.
What is the cause of the massive amount of programmed cell death of nerve cells (neurons) that occurs in the developing vertebrate nervous system, and what purpose does it serve?
What will be an ideal response?