On a warm summer day in August, you decide to go for a walk through a new housing development that was built near your home a few years ago. As you walk by the pond that's in the center of this development, you notice an unpleasant smell
Then, you see that the pond is full of green algae, and there are dead fish floating on the surface. This is a pond that used to be clean and clear, and you used to play in it as a child. What could have most likely caused this change? A) Too many people are discarding food and other wastes in the pond, causing increased algal growth.
B) Lawns are being overfertilized, causing excess fertilizer to wash into the pond, stimulating algal growth.
C) The low reflectance of the surrounding area is heating up the pond, causing increased algal growth.
D) The salting of the roads during icy conditions in the winter has resulted in the runoff of salt and thus stimulated algal growth.
B
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Indicate whether the statement is true or false.
Phylogenetic oligonucleotide arrays (POAs) contain rRNA sequences as probes and are used as a means to detect complementary rRNA sequences from the environment.
Answer the following statement true (T) or false (F)
Nucleosomes are best described as:
a. eukaryotic DNA associated with histone proteins. b. prokaryotic DNA associated with nonhistone proteins. c. eukaryotic DNA associated with nonhistone proteins. d. prokaryotic DNA associated with histone proteins. e. eukaryotic DNA associated with scaffolding proteins.
Cells called ______________ release chemicals that kill bacteria and everything else in an area, including themselves.
A. monocytes B. macrophages C. basophils D. neutrophils