Flowering plants appeared in the fossil record in the:a
Tertiary period.
b. Cenozoic era.
c. Paleozoic era.
d. Late Cretaceous period.
e. Jurassic and Lower Cretaceous periods.
e
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A shift from expected allele frequencies, resulting from chance, is known as
(a) natural selection. (b) genetic drift. (c) mutation. (d) gene flow.
Answer the following statements true (T) or false (F)
1. Rosalind Franklin did not share in the Nobel Prize for determining the structure of DNA, although her work was critical to it, because she had died, and it is only awarded to living people. 2.Next-generation sequencing reads millions of sequences at once, and so the general approach is also called "massively parallel DNA sequencing." 3. The "methylome" is the collection of all the methylated sites in the genome. 4. Allelic disorders may result from mutations in different parts of the same gene.
Refer to the accompanying figure. The structure labeled as 7 in the figure of the tryptophan operon is a(n):
a. active repressor protein. b. inactive repressor protein. c. active RNA polymerase. d. inactive RNA polymerase. e. ribosome.
The following are all main points of the article Animal Sculptors of the Seafloor except:
a. Gray whales feed in a way that preserves habitat of their prey b. Biological activities can alter large expanses of seafloor. c. The previous ideas about the feeding biology of large marine mammals were refined. d. Feeding activities enhance the area's productivity. e. Walruses overgrazed clam beds, causing environmental collapse.