Which gymnosperm is deciduous and widely planted in cities because of its resistance to insect predators, air pollution, and disease?
A. cycad
B. ginkgo
C. pine
D. spruce
E. juniper
Answer: B
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In SDS–polyacrylamide gel electrophoresis proteins are partially denatured and separated entirely as a function of their mass
Histones are an exception; they migrate more slowly than they should, as though they are much larger than they actually are. Why does this occur? A. Histones form dimers and tetramers, making them appear larger. B. Histones are heavily glycosylated, greatly adding to their mass. C. Histones have a large number of positively charged amino acid residues. The binding of SDS to the histones is not sufficient to mask these charges, resulting in slower migration. D. Histones have an affinity for polyacrylamide. E. Histones are somewhat insoluble, which slows their passage through the gel.
The transforming principle described by Griffith in his work with Streptococcus pneumoniae is ____
a. a polysaccharide capsule b. a phospholipid c. protein d. RNA e. DNA
What route is being followed by water that moves through living cells in a root?
a. the symplastic and epidermal pathways b. the transmembrane and apoplastic pathways c. the transmembrane and symplastic pathways d. the apoplastic and epidermal pathways
One of the important inherited defects in the second line of immune defense is a condition called chronic granulomatous disease. What is this disease, and how is it caused?
What will be an ideal response?