Integral proteins with carbohydrates (sugars) attached that stick out on the exterior surface of cello membranes help recognize "self" and are called ______________.
a) amino acids
b) lipoproteins
c) glycoproteins
d) monosccharides
Ans: c) glycoproteins
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What is the minimum number of immunoglobin molecules possible if there are 3,000 variants possible for the light chain and 5,000 variants possible for the heavy chain?
What will be an ideal response?
The "hygiene hypothesis" proposes that
A. lack of exposure to microbes can promote development of allergies. B. cleanliness truly is next to godliness. C. hand washing is the best preventative measure against infection. D. the immune system develops best in a clean environment.
The function of a central cell is to
a. collect pollen for fertilization. b. develop into an egg. c. develop into a pollen grain. d. store food for the seed.
In the process of blood clotting, platelets ____
a. engulf and digest cellular debris b. release substances that repel more platelets c. convert fibrin into fibrinogen d. clump together e. do nothing as they are not involved in clotting.