What is the function of hemoglobin?
a. to transport nutrients
b. to transport oxygen
c. to transport carbon dioxide
d. to transport oxygen and carbon dioxide
e. to transport wastes
D
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The nitrogenous base that is only found in RNA and not DNA is:
A. adenine B. cytosine C. uracil D. guanine E. thymine
The appropriate folding of a newly translated protein is essential, and chronic misfolding often leads to disease, especially in vertebrates. This misfolding, particularly in the case of prion diseases, may be due to a defect in
A) the enzyme foldase. B) insertion of proper amino acids during translation. C) proteosome function. D) chaperone activity. E) translocase.
Which cells require specific antigens to become activated?
a. dendritic b. B and T cells c. macrophages d. phagocytes e. cytokines
Lipopolysaccharides are correctly described as
I. Found in both Gram(-) and Gram(+) bacteria II. Contains lipid A as part of its structure III. Infection of which are treated by antitoxin A. I only B. II only C. I and II only D. II and III only E. I, II, and III