In the following pedigree, the indicated trait is most likely caused by which type of allele?
A) autosomal recessive
B) autosomal dominant
C) X-linked recessive
D) X-linked dominant
E) Y-linked
A) autosomal recessive
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Which one of the following cell types would likely have the most extensive system of smooth endoplasmic reticulum?
A. skin cells B. pancreatic cells that secrete digestive enzymes C. testicular cells D. central nervous system cells E. muscle cells
Among the following substances contaminating Aberdeen Proving Ground in Maryland, which is an organic compound
that damages the nervous system, liver, and lungs?
a. lead b. arsenic c. dimethyl chloride d. trichloroethylene e. mercury
Human B lymphocytes mature in an intestinal region called the bursa.
Answer the following statement true (T) or false (F)
Phospholipids assemble spontaneously into bilayers driven by the attraction of their "tail" portions to each other and of their "head" portions to each other. The tail regions are:
A) hydrophilic. B) hydrophobic. C) molecularly charged. D) adhesive. E) cohesive.