The cell walls of plant cells that have stopped
growing and actively dividing are characterized by
the presence of
a. pectin.
b. cellulose.
c. glue-like polysaccharides.
d. lignin.
e. a gluey matrix containing rope-like strands.
Answer: d
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In the figure above, which community has the highest species diversity?
A) Community 1 B) Community 2 C) Community 1 and community 3 have the highest species diversity. D) Community 4
In general, a signal transmitted via phosphorylation of a series of proteins _____
A) results in a conformational change to each protein B) requires binding of a hormone to an intracellular receptor C) activates a transcription event D) generates ATP in the process of signal transduction E) occurs within the outer plasma membrane
During sexual reproduction, each parent contributes one set of chromosomes. Members of a pair of chromosomes (one from each parent) are called __________
A. karyotypes B. sister chromatids C. homologs D. sex chromosomes
Which statement about mosses is true?
a. Mosses are sensitive to air pollution. b. Mosses are a seedless vascular plant. c. Mosses display jointed stems and leaves. d. Mosses develop deep rhizoids in the tundra.