The synthesis of a growing strand of DNA is carried out by adding nucleotides to the ___ end of an existing strand.
A. 2'
B. 3'
C. 5'
D. 1'
B. 3'
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Peptide hormones are often made in advance and kept in cells awaiting signals to secrete. Where are they stored?
a. in vesicles outside the producing cell b. in vesicles in the fat layer c. in vesicles inside the producing cell d. in vesicles in the brain
______ are where saltwater and a source of freshwater mix.
a. Wetlands b. Estuaries c. The benthic zone d. Channels
Use the phylogenetic tree below to answer the following question(s).
Which of the following statement is correct regarding the phylogenetic tree above?
A. The polar bear and the brown bear are the most recently evolved species. B. The sun bear's closest relative is the sloth bear. C. Most bears on the phylogenetic tree are extinct. D. The American black bear has no closely related species.
Ionizing radiation that can harm living cells does so by
a. creating chemical compounds. b. lysing lysosomes. c. removing electrons from atoms to create positive ions. d. creating buffers. e. destroying buffers.