Which of the following is the MOST accurate description of Endotoxins?
A. They are lipopolysaccharides located in the outer membrane of gram-positive bacteria only
B. They are lipopolysaccharides located in the outer membrane of gram-negative bacteria only
C. Highly antigenic, induce antitoxins, and do form toxoids
D. Many have A-B subunit structure in which A subunit is the active one and the B unit is the one that binds into the cell
E. They are polypeptides secreted by certain bacteria that alter cell functions resulting in symptoms of disease
Ans: B. They are lipopolysaccharides located in the outer membrane of gram-negative bacteria only
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The human immunodeficiency virus (HIV) only affects a specific class of cells in the immune system called helper T cells, and not other types of T cells. Which is the best explanation for this observation?
A. Only helper T cells have the correct receptor on their cell surface. B. HIV can only be released from helper T cells. C. Only helper T cells have reverse transcriptase. D. HIV can only replicate inside of helper T cells. E. The helper T cells are not necessary for the immune system to fight viral infections.
The atomic number of an atom is determined by the number of
1.electrons 2.neutrons 3.protons 4.isotopes
The presence of a uniform distribution among plants is often used as an indication that ________ is occurring
Fill in the blank(s) with correct word
New gene variations are constantly being introduced into populations through random mutations.
Answer the following statement true (T) or false (F)