Malarial parasites' favorite food source is
a. chitin.
b. collagen.
c. myosin.
d. hemoglobin.
e. fibrinogen.
D; Malarial parasites live and do most of their multiplication inside red blood cells where they eat the hemoglobin.
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Match the following items with the correct phrases.
_______1. A monomer; the most common type of immunoglobulin; very high levels are produced in the secondary (anamnestic) response to an antigen. _______2. A pentamer; five monomers linked together by a J-chain; the first type of immunoglobulin to be formed in the primary response to an antigen. _______3. A monomer; present on the surface of mast cells and basophils. _______4. A dimer; two monomers linked together by a J-chain; frequently found in mucous membranes. _______5. Produced by atopic individuals in response to allergens. a. IgA b. IgD c. IgE d. IgG e. IgM
The following classes or superclasses of fish are matched with an example. Select the mismatched pair.
A. Chondrichthyes—sharks B. Placodermi—lobe-finned fish C. Myxini—hagfish D. Osteichthyes—bony fish
Imagine an earthworm that has no chaetae. How would the lack of chaetae affect movement of the earthworm?
A. The earthworm would be much flatter than normal since it has no hydrostatic skeleton. B. The earthworm would only be able to extend its body segments. C. The earthworm would only be able to shorten its body segments. D. The earthworm would have difficulty changing locations, since it cannot anchor itself in the soil. E. The earthworm would not be able to move at all.
The neuron transport proteins that maintain the resting membrane potential are ____.
A. sodium-phosphorus passive transporters B. sodium-potassium pumps C. sodium-chlorine gated channels D. phosphorus-calcium pumps E. phosphorus-chlorine gated channels