Scales and paired fins first evolved in __________fishes.
Fill in the blank(s) with the appropriate word(s).
jawed
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Your dog has flu caused by an H3N8 strain. Assume that you breathe in this strain, after you have already come in contact with an H1N1 strain. Both viruses go into the cells of your upper respiratory tract. During the viral replication cycle inside of your epithelial cells, genetic information for hemagglutinin antigen and for neuraminidase antigen are recombined. Your cells end up producing a new variant---H3N1. Predict what might happen as a result of this set of events.
A. This is not a problem because the human immune system can respond quickly to any new antigens never seen before. B. Since this new virus has antigens from a dog strain, the new strain will not be able to infect human cells. C. This novel virus will spread through the human population without much resistance. D. Only people who have never had flu before will get sick from the new H3N1 variant.
How does carbon buried in deep ocean sediments return back to the surface?
a. it floats to the surface b. it is brought up by fish c. storms stir up the ocean bottom d. wave motion brings it up e. uplifting of the sea floor
What are the predicted phenotypes of the female children from the union of a woman who is
heterozygous for hemophilia and a man who has normal blood clotting characteristics? (Use the Punnett square to verify your answer.) a. all carriers b. 3 homozygous normal : 1 carrier c. 1 homozygous normal : 1 carrier d. 1 hemophilia: 2 homozygous; normal : 1 carrier e. all hemophiliacs
What is a pure culture?
What will be an ideal response?