Once a steroid hormone binds with its intracellular receptor, the hormone-receptor complex binds with a specific hormone response element on DNA, thereby activating a particular gene
Indicate whether the statement is true or false
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Which of the following is something antibodies do not do?
A) Link antigen molecules together B) Bind antigen molecules of two or more enemy cells and stick them together C) Bind to enemy cells, thus changing their shape so their complement-binding sites are exposed D) Neutralize antigens by binding to regions of an antigen that can be pathogenic E) Differentiate into memory antibodies, which upon reexposure to the same pathogen would mount a quicker attack
The plateau portion of the O2-Hb curve
a. is in the blood-PO2 range that exists at the pulmonary capillaries. b. means that hemoglobin becomes almost nearly saturated in the lungs unless the pulmonary capillary PO2 falls below 60 mm Hg. c. is in the blood-PO2 range that exists at the systemic capillaries. d. both (a) and (b) above. e. both (b) and (c) above.
When placed in a solution, HNO3 dissociates into H+ and NO3-. The compound HNO3 must be a(n) ________.
A. electron. B. acid. C. base. D. nucleotide.
A person with heart failure is experiencing an increase in fluid returning to the venous circulation. Which body structures are most likely to visibly indicate this is happening?
A. Right and left atria B. Coronary arteries C. Tissues in the periphery D. Pulmonary arteries