How are the epigenetic marks of a particular chromatin state preserved during cell division?
A. Parental, marked H2A-H2B dimers stay associated with strands after replication and recruit new H3-H4 tetramers.
B. H2A-H2B dimers and H3-H4 tetramers come off during replication and assemble with unmarked histones. These new octamers then rebind to the newly replicated DNA to form nucleosomes.
C. Parental, marked H3-H4 tetramers stay associated with strands after replication and recruit new H2A-H2B dimers.
D. Histone chaperones make sure that at least one component of each new nucleosome is marked.
E. None of these choices is correct.
B
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An animal that can maintain a constant internal body temperature regardless of environmental changes is called
a. homotherm b. cold-blooded c. an endotherm d. an ectotherm
From his observations of organisms in the Galapagos islands, Darwin reasoned that _____.
A. all island species should be similar to each other B. organisms had adapted to new environments, giving rise to new species C. the shape of a bird's beak does not affect its ability to survive and reproduce D. the organisms in the Galapagos had been specially created to thrive in that environment E. none of the above
________ is measured over decades and includes many parameters and this change is directly correlated with fossil fuel combustion to CO2. Seeing more of the "hottest days on record" and noting the average global surface temperature is predicted to rise between 1.1 and 6.48°C by 2100 is connected to ________.
What will be an ideal response?
How many chromosomes are there in a maize (corn) embryo cell nucleus as compared to a maize (corn) endosperm cell nucleus?
A) half as many B) two-thirds as many C) the same number D) twice as many