What is the first step of DNA replication?
a. The DNA helix unwinds.
b. The DNA polymerase adds nucleotides.
c. RNA primers are removed.
d. DNA fragments join ligase.
a. The DNA helix unwinds.
When the DNA helix unwinds, it is the first step of DNA replication.
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Before the publication of Charles Darwin's On the Origin of Species, what was the prevailing public consensus regarding species evolution?
A. That species evolved through physical changes that led to success B. That species were permanent and unchanging C. That species were modified over time but did not change into new species D. That species evolved by means of natural selection
Male mallards have had emerald green head
feathers and wings with metallic blue patches for hundreds of years, whereas female mallards have been drab, brown-feathered ducks. This phenotypic situation suggests that mallards may be an example of a. directional selection. b. polyploidy. c. allopatric speciation. d. disruptive selection. e. sexual selection.
A disease that is associated with changes in chloride and water movement into and out of exocrine
glands, dry and thickened mucus in the airways, and an increase in the incidence of respiratory infections is a. pneumonia. b. influenza. c. cystic fibrosis. d. bird flu. e. lung cancer.
"Gene doping" with Repoxygen has the goal of increasing the production of ____________________
cells in athletes. Fill in the blank(s) with the appropriate word(s).