The lipopolysaccharides are associated with the
a. outer membrane of Gram-positive bacteria.
b. outer membrane of Gram-negative bacteria.
c. plasma membrane of Gram-positive bacteria.
d. plasma membrane of Gram-negative bacteria.
e. plasma membrane of both Gram-positive and Gram-negative bacteria.
B
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Once transduction of a signal is complete, the receptor and its bound signal molecule are removed
from the cell surface by ____.
a. hydrolysis b. diffusion c. endocytosis d. pinocytosis e. exocytosis
In 1997, a gene called Le was discovered by two research groups led by David Martin and Diane Lester. Allelic variation in the Le gene, which controls elongation of the plant stem between branches, is responsible for which trait in peas?
A) inflated and constricted pod shape B) yellow and green pod color C) purple and white flowers D) tall and short plant height E) axial and terminal flower position
Helicobacter pylori can survive in the stomach because it is tolerant to ________ pH
a. low (acidic) b. low (basic) c. high (acidic) d. high (basic)
Which of the following organisms grow on higher plants to produce truffles?
A) euglenids B) kinetoplastids C) mycorrhizae D) lichens E) water molds