Which is true about mediated transport of substances across cell membranes?
A. It involves a specific membrane protein that functions as a carrier molecule.
B. It always involves the movement of substances against a concentration gradient.
C. It is always directly coupled to the splitting of ATP molecules.
D. There is no limit to how fast it can occur as the concentration gradient becomes larger.
E. It is the main mechanism for transporting hydrophobic molecules across membranes.
A
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Which of the following conditions results when the articular cartilages in a joint degenerate to the point where the bony ends of articulating bones touch?
a) osteogenic sarcoma b) rickets c) osteomalacia d) osteoarthritis e) osteopenia
Which of the following is not a method for helping prevent pressure ulcer formation?
A) Massaging the skin B) Eating foods rich in protein C) Maintaining one body position D) Providing adequate fluid intake
The space between the presynaptic and postsynaptic neurons is called the synaptic knob
a. True b. False Indicate whether the statement is true or false
The thymus is where ________ mature and become functional immune cells.
A. pre-B cells B. macrophages C. null cells D. C cells E. pre-T cells