The smooth ER is the primary site for the synthesis of proteins and cholesterol needed to make
membranes.
__________________Indicate whether the statement is true or false.
F, phospholipids
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Salmonella is commonly associated with wound infections
Indicate whether the statement is true or false.
Which of the following is the correct sequence of events in cross-bridge cycling?
A. Myosin cross-bridge binds to actin, the powerstroke moves the thin filament relative to the thick filament, ATP binds to myosin and cross-bridge detachment occurs, ATP is hydrolyzed and the myosin head is "cocked." B. The powerstroke moves the thin filament relative to the thick filament, myosin cross-bridge binds to actin, ATP binds to myosin and cross-bridge detachment occurs, ATP is hydrolyzed and the myosin head is "cocked." C. Myosin cross-bridge binds to actin, ATP is hydrolyzed and the myosin head is "cocked," the powerstroke moves the thin filament relative to the thick filament, ATP binds to myosin and cross-bridge detachment occurs. D. Myosin cross-bridge binds to actin, ATP binds to myosin and cross-bridge detachment occurs, the powerstroke moves the thin filament relative to the thick filament, ATP is hydrolyzed and the myosin head is "cocked." E. These events can occur in any sequence without affecting muscle function.
Which of the following is NOT true about invasive species?
A. Invasive species generally reproduce rapidly. B. Invasive species are the key living species on which the community depends for survival. C. Invasive species are without any natural enemies in a new environment. D. The zebra mussel is an example of an invasive species. E. Asian carp is an example of an invasive species.
Please choose the statement that best describes the immunologic basis of organ or tissue rejection after transplantation.
A) Specific T cell populations recognize non-self MHC molecules on transplanted tissue and mount a cell-mediated immune response damaging the transplant. B) Transplanted tissue is normally rejected only if it becomes infected. C) Organ/tissue transplant rejection is mostly due to Type 2 cytotoxic reactions mediated by IgG and IgM. D) IgE antibodies as well as basophils and mast cells attack the transplanted tissue if they recognize it as "non-self."