What type of molecule is shown in the diagram? Where in a eukaryotic cell would this type of molecule be commonly found? What special chemical properties does this molecule possess that allows it to accomplish its functions?
What will be an ideal response?
This is a phospholipid found in the plasma membranes of eukaryotic cells. It has a polar hydrophilic head group and a nonpolar hydrophobic tail group making it amphipathic. This chemical property allows it to form the lipid bilayer of the membrane with its polar group oriented on the surface of the membrane and its hydrophobic tails oriented away from the surrounding water in the interior of the lipid bilayer.
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The pH value measures the levels of ________
A) WBCs and RBCs B) Antigens and antibodies C) Electrolytes D) Acidity and alkalinity
If the connection between the AV node and bundle of His becomes blocked,
A) the ventricles will beat more slowly. B) the ventricular rate of contraction will not be affected. C) tachycardia will occur. D) the stroke volume will increase. E) the ventricles will beat faster.
An enzyme that will digest proteins into peptides is
A) amylase. B) nuclease. C) trypsin. D) maltase. E) lipase.
Most endocrine reflexes are controlled by
A) positive feedback. B) autoregulation. C) negative feedback. D) the nervous system. E) All of the answers are correct.