A drug called ouabain specifically inhibits the sodium-potassium pump present in neuron cells. Over time, what would this action of ouabain cause?
A) the inside of the neuron to become more negative
B) repolarization
C) elimination of a concentration gradient
D) more potassium to be transported into the neuron
C
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Identify the non-lipid molecule.
A. Phospholipids B. Cholesterol C. Steroids D. Glycogen E. Triglycerides
Which item has not been tested by the Food and Drug Administration for safety and effectiveness?
A) aspirin B) multivitamin C) antibiotic D) cough medicine
Rank the following one-base point mutations (from most likely to least likely) with respect to their likelihood of affecting the structure of the corresponding polypeptide
1. insertion mutation deep within an intron 2. substitution mutation at the third position of an exonic codon 3. substitution mutation at the second position of an exonic codon 4. deletion mutation within the first exon of the gene A) 1, 2, 3, 4 B) 4, 3, 2, 1 C) 2, 1, 4, 3 D) 3, 1, 4, 2
Which of these structures converts highly toxic ammonia into urea, a less toxic form of nitrogenous waste?
A) Muscles B) Liver C) Spleen D) Pancreas E) Kidney