How do modified and unmodified histone subunits become distributed among nucleosomes after replication?
A. The newly synthesized DNA strand contains unmodified histone subunits, while the old strand retains the modified histones.
B. Both strands of DNA are repopulated first with a mixture of modified and unmodified H2A histones, followed by mixtures of H2B, H3, and, finally, H4.
C. Both strands of DNA are repopulated first with a mixture of modified and unmodified H2A and H2B histones, followed by mixtures of H3 and finally mixtures of H4.
D. Both strands of DNA retain H3-H4 modified pairs, and then are repopulated with unmodified H3-H4 pairs, followed by modified and unmodified H2A-H2B.
E. Both strands of DNA retain H2A-H2B modified pairs, and are then repopulated with unmodified H2A-H2B pairs and then mixtures of modified and unmodified H3-H4 pairs.
D
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The three phylogenetic trees shown here all contain the same members and all have a common ancestor, but are divided up in three different ways. Which tree has members circled that are of more than one evolutionary line and does not include the most recent common ancestor of the included lineages? What type of group is this?
A. Tree 1; monophyletic.
B. Tree 2; polyphyletic.
C. Tree 2; paraphyletic.
D. Tree 3; monophyletic.
E. Tree 3; polyphyletic.
You are given a box of bones, which includes a tall narrow pelvis and a foot with non-aligned toes. Which statement
can be supported by these bones? a. The animal could brachiate. b. The animal was a tree dweller. c. The animal was an anthropoid. d. The bones belonged to a bipedal organism. e. The bones belonged to a quadrupedal organism.
An organic molecule contains two or more atoms of
A. carbon. B. hydrogen. C. oxygen. D. All of these answers are true.
Hydrogen bonds are non-polar.
a. true b. false