A DNA molecule is made up of:
a. lipids
b. proteins
c. nucleotides
d. fatty acids
e. carbohydrates
c
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Which of the following statements is a valid conclusion of this experiment?
A) Balanus can survive only in the lower intertidal zone because it is unable to resist desiccation. B) Balanus is inferior to Chthamalus in competing for space on rocks lower in the intertidal zone. C) The two species of barnacles do not compete with each other because they feed at different times of day. D) The removal of Balanus shows that the realized niche of Chthamalus is smaller than its fundamental niche. E) These two species of barnacle do not show competitive exclusion. F) If Chthamalus were removed, Balanus's fundamental niche would become larger.
When complexing with histones, the DNA phosphodiester backbone is in close proximity to:
A. the histone fold, two ? helices connected by two short links, this motif being found within H1, H2A, H2B, H3, and H4 B. the histone fold, two ? helices connected by two short links, this motif being found within H2A, H2B, H3, and H4 C. the histone fold, three ? helices connected by two short links, this motif being found within H1, H2A, H2B, H3, and H4 D. the histone fold, three ? helices connected by two short links, this motif being found within H2A, H2B, H3, and H4
In mammals, gas exchange between the air and blood takes place across the walls of the
A. diaphragm. B. pleural membrane. C. trachea. D. gills. E. alveoli.
The most important aspect of agar that makes it a useful ingredient for solidifying media for bacterial culture is ________.
A. because it provides an excellent carbon and energy source for bacteria B. because it melts at 100oC and solidifies at temperatures below 40oC C. because bacteria are unable to break it down so it stays solidified D. because it provides an excellent nitrogen source for bacteria