Which of the following is not true of histone tails?
A. They protrude between the two DNA strands that supercoil around the nucleosome.
B. They are the target of numerous chemical modifications.
C. They experience changes in net charge, shape, and other properties of histones in response to modifications.
D. They are recognized by acetylases and methylases.
E. They have enzymatic properties that can covalently modify DNA.
E
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To approach females, male spiders plug the web of the female to alert her to their presence
and to communicate that they are a potential mate rather than a prey item. This type of communication involves __________.
a. mechanoreceptors b. a cochlea c. depth perception d. pheromones
Leghemoglobin, which contains an iron-containing heme group, is used to
a. remove O2 from roots. b. produce H2O from O2. c. deliver O2 to bacteroids. d. transport O2 in the xylem. e. produce O2 from H2O.
In many plant species, older roots and stems thicken by activity at _____
a. apical meristems c. vascular cambium b. cork cambium d. both cork and vascular cambium
What is the age structure of a population?
A) the curve that results when the likelihood of dying is plotted as a function of age B) the curve that results when the likelihood of being alive is plotted as a function of age C) the number of individuals alive in different age-groups at one time point D) the difference in the age distribution of a population at two different points in time