Which statement describes the function of the histones in eukaryotic cells?
A) They help the double-stranded DNA molecule unwind from its coiled-up configuration.
B) They help direct the dividing of the cytoplasm into two daughter cells.
C) They function as catalysts in the replication phase of cell division.
D) They enable DNA to be tightly and efficiently packed inside the nucleus.
E) They serve as the attachment site for the chromosomes before replication.
D) They enable DNA to be tightly and efficiently packed inside the nucleus.
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Why are invasive species, like the Brown tree snake in Guam, so successful in their new range? Select all that apply.
_____ They are able to adapt to any type of climate. _____ Their new food source has no form of defense against them. _____ In their new range, they have few or no natural predators to control their population growth. _____ They can mimic other toxic species. _____ They have no carrying capacity in their new range.
Why doesn't a tapeworm have a mouth on its scolex?
A. The mouth is on the proglottids B. Endoparasites don't need a mouth C. The mouth is located at the end of the pharynx D. Tapeworms use a radula instead of a mouth to feed
What evidence do we have that some asteroids have surfaces modified by geological processes?
What will be an ideal response?
Which of the following observations best indicates that living things evolved in different time periods?
a. Extinct organisms found only as fossils were destroyed in global catastrophes. b. Layers of rock are deposited in a slow, gradual process. c. Species in a location resemble one another more than species in another location. d. Fossil A always appears in a layer below fossil B. e. In many parts of the world, a rock layer of type A always appears below a rock layer of type B.