A branching tree that represents the evolutionary relationships among a number of species is, in scientific terms, called a(n)
A. family tree.
B. pedigree.
C. androgeny.
D. phylogenetic tree.
Answer: D
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Diazotrophs maximize nitrogenase activity by
A) closely coupling N2 fixation with high rates of photosynthesis. B) fixing N2 at times when oxygen is absent or in low concentrations. C) producing specialized structures to protect nitrogenase from oxygen. D) producing specialized structures or fixing N2 at times when oxygen is absent to protect nitrogenase from oxygen.
Which of the following statements does not accurately describe the navigational ability of homing in birds?
A. Homing pigeons have map sense, which most likely includes landmarks as well as olfactory and visual cues. B. Homing pigeons use the sun and stars as well as the magnetic field to find their way "home" over long distances. C. If a homing pigeon is fitted with a magnetic helmet, it would not be able to find its way on a cloudy day. D. If a homing pigeon is fitted with a magnetic helmet, it would not be able to find its way on a cloudy day, but it would be able to navigate on a sunny day because it would still be able to use the sun as a compass. E. A biological clock used for time cues is not necessary for a homing pigeon to use the sun compass.
Which of the following is true of a
methylation?
a. the particular methylation is passed on in mitosis b. chemicals in cigarette smoke remove methyl groups c. methylation is never a random event d. histones are immune to methylation e. methylation is always harmful
The spindle fibers are made up of
A) golgi bodies B) microtubules C) microfilaments D) intermediate filaments