Stepwise condensation of linear DNA happens in five different packing processes. Which of the following four processes has a direct requirement for histone H1?
(a) formation of "beads-on-a-string"
(b) formation of the 30-nm fiber
(c) looping of the 30-nm fiber
(d) packing of loops to form interphase chromosomes
(b)
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Select the true statements describing why cladistics may not always be the best method for reconstructing phylogenies based on data from the DNA genome.
_____ The rate of evolution of the DNA genome is rapid. _____ The assumptions of the principle of parsimony are not always met. _____ Homoplasy often dominates the data sets. _____ The number of character states for DNA is large.
Which of the following events occurs during prophase I?
a. one full set of chromosomes arrives at each spindle pole b. crossing over c. spindle microtubules connect chromosomes to spindle poles d. separation of sister chromatids
Fossils indicate that the first cells were similar
to existing a. viruses. b. fungi. c. prokaryotes. d. eukaryotes. e. algae.
The ________ bone contains the foramen magnum
Fill in the blank(s) with correct word