Steroid hormones do not require membrane receptors because they
a. are small enough to pass directly through the membrane.
b. are lipid-soluble like the bilayer.
c. pass through special channels.
d. are water-soluble.
e. dissolve in the cholesterol of the membranes.
B
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Sickle-cell anemia is caused by a recessive mutation in the hemoglobin gene. However, heterozygote individuals also show a small percentage of sickled red blood cells. What type of inheritance pattern is this an example of?
A) Polygenic inheritance B) Sex linked C) Chromosomal nondisjunction D) Incomplete dominance
Movement of sodium across the cells of the collecting duct relies on which one of the following?
A) tubular secretion B) glomerular filtration C) tubular reabsorption D) active transport E) bulk flow
Cardiac muscle cells are connected by special junctions called intercalated discs. Intercalated discs provide strength between cells of tissues which exhibit high mechanical stress, strong flexible connections between tissue cells, and electrical excitability between the cells. Using this information, which junctions are present in intercalated discs?
A. Tight, plasmodesmata, and adherens B. Tight, plasmodesmata, and desmosomes C. Gap, adherens, and desmosomes D. Gap, desmosomes, and hemidesmosomes E. Adherens, tight, and gap
The primer for retrovirus reverse transcription is a specific
A) tRNA encoded by the cell. B) tRNA encoded by the virus. C) nuclear tRNA. D) nuclear tDNA.