Which of the following is least likely to be found in a cell membrane?
a. phospholipid
b. nucleic acid
c. steroid
d. protein
e. carbohydrate
B
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In the late 1960's, Robert Paine conducted landmark studies on diversity in the rocky intertidal zone comparing the species diversity in control plots with diversity in experimental plots from which he removed the top predator, sea stars
After 5 years, 15 species of intertidal invertebrates lived in the control plots, while the experimental plots were dominated by only two species, one mussel and one barnacle. Why did species diversity most likely remain high in the presence of a predator? A. The sea star kept the mussel and barnacle populations low enough to prevent competitive exclusion from occurring. B. The sea star kept the mussel and barnacles from developing a mutualistic relationship. That, in turn, kept their populations low. C. The mussel and the barnacle parasitized the sea star, keeping populations low enough to prevent competitive exclusion from occurring. D. The sea star developed a mutalistic relationship with the mussel and barnacle, keeping their populations low and preventing competitive exclusion from happening.
A major cause of blindness in the United States that results from the HSV 1 virus is ________.
Fill in the blank(s) with the appropriate word(s).
Communal courtship grounds, or ________, are areas where males congregate to display to females
Fill in the blank(s) with correct word
Which of the following metals is NOT used by nitrogenase?
a. magnesium (Mg) b. molybdenum (Mo) c. vanadium (V) d. iron (Fe)