All trees belonging to species A have started to die mysteriously if left untreated. Affected trees that are treated with a fungicide recover. Also, trees in parks that have been treated with broad-spectrum insecticides will not get sick
Which of the following is the most parsimonious explanation for the dying of trees belonging to species A?
a. The trees are killed by the feeding activity of insects alone.
b. The disease is vectored by insects.
c. All trees are killed by a wind-borne fungal disease.
d. Some trees are killed by fungal infections while others are killed by insect feeding.
e. A and B are equally parsimonious.
B
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The typical osmolarity of body fluids in most freshwater invertebrates is about ____ mOsm/L
a. 5 b. 225 c. 300 d. 1000 e. 1500
Four of the five answers listed below are functions of epithelium. Select the exception
a. absorption b. contracting c. covering d. lining e. secreting
Bacteria that normally live on or in the body and prevent other bacteria from becoming too numerous are referred to as ________
A) beneficial bacteria B) pathogens C) parasitic D) bacterial toxins
Histone variants may be found in nucleosomes
a. that are present during double-strand break repair. b. that are disrupted during active transcription. c. in centromeric regions. d. that compact chromatin in sperm cells. e. All of the above.