Cyclins function by ________.
Fill in the blank(s) with the appropriate word(s).
Answer: combining with kinases
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The body of a bilaterally symmetrical animal can divided into two equivalent halves by more than one
plane. ____________________ Indicate whether the statement is true or false.
Bacteria typically have _______, whereas eukaryotes have _______.
a. one chromosome that is circular; many chromosomes that are linear b. several chromosomes that are circular; many chromosomes that are linear c. one chromosome that is linear; many chromosomes that are circular d. two chromosomes that are circular; eight chromosomes that are linear e. None of the above
Rivers typically lack a(n) (anaerobic/littoral/limnetic) zone.
Fill in the blank(s) with the appropriate word(s).
Most eukaryotic cells only express 20–30% of the genes they possess. The formation of heterochromatin maintains the other genes in a transcriptionally silent (unexpressed) state
Which histone modification directs the formation of the most common type of heterochromatin? (a) H3 lysine 4 methylation (b) H3 lysine 9 methylation (c) H3 lysine 14 methylation (d) H3 lysine 27 methylation