Major histocompatibility complex (MHC) molecules are what type of membrane protein?
a. enzyme
b. anchoring protein
c. receptor protein
d. recognition protein
Answer: d. recognition protein
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Oxygen did not accumulate in the early atmosphere until it reacted with reduced materials, especially ________, in the oceans
A) hydrogen B) elemental sulfur C) ferrous iron D) nitrate
In S. pyogenes, which of the following interferes with phagocytosis?
A. M protein B. Protein A C. Collagen D. Pilin
Each of the following is associated with F factor transfer from an F+ bacterium to an F? bacterium except
A) transfer involves conjugation. B) transfer of the plasmid begins at the plasmid origin of transfer. C) transfer of the plasmid converts the original F+ cell to an F? cell. D) following transfer, the F factor can become integrated into the F? cell genome to generate an Hfr cell. E) All the above are associated with the F factor transfer.
Chromatin is composed of DNA and special packaging proteins called hopanoids
Indicate whether the statement is true or false