Which best describes the main role of adenosine triphosphate (ATP)?
A. It is an amino acid that is part of polypeptide chains that serve structural functions within cells.
B. It is a nucleotide that makes up the backbone of DNA and RNA molecules, that harbor the genetic code.
C. It is a carbohydrate molecule that can be stored in large quantities in the liver to energize cellular processes.
D. It is a purine derivative created from the breakdown of fuel molecules, that transfers energy for cellular processes.
E. It is a waste product of aerobic metabolism that is excreted from the body by the kidneys.
D
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What are the receptors for dynamic equilibrium?
A) maculae B) cristae C) ampulla D) None of the listed responses is correct.
The muscle that inserts on the coronoid process of the mandible is the
A) temporalis. B) masseter. C) orbicularis oris. D) zygomaticus. E) platysma.
Cellular responses to hormones that initiate second-messenger systems include ________.
A) possible activation of several different second-messenger systems B) cyclic AMP phosphodiesterase formation of an active second messenger C) formation of a specific protein kinase that acts on a series of extracellular intermediates D) hormone binding to intracellular receptors
Fred suffers from chronic emphysema. Blood tests show that his pH is normal but his bicarbonate levels are elevated significantly. How can this be?
What will be an ideal response?