The STD that will always produce symptoms is ________
A) gonorrhea
B) chlamydia
C) syphilis
D) HPV infection
C
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What new information was conclusively demonstrated by the Hershey and Chase experiment pictured on the previous slide?
1.DNA contains phosphorous but not sulfur.
2.Prophage DNA was injected into the bacterial cells while prophage protein remained outside.
3.DNA is the genetic material.
4.Protein contains sulfur but not phosphorous.
5.Prophage protein was injected into the bacterial cells while prophage DNA remained outside.
What is the predominant hypothesis for why animals only appeared in the fossil record about 3 billion years after life originated?
A. There were animals 3 billion years ago; they just weren't fossilized. B. Animals are warm-blooded; the ocean was too cold for animals to evolve 3 billion years ago. C. Animals have higher metabolisms, and animal diversification and evolution didn't really happen until there was sufficient oxygen in the atmosphere. D. Animals are heterotrophic and couldn't evolve until there were enough photosynthetic organisms on Earth to support being eaten by animals.
The nucleoli, found within the nucleus, are the sites of ____ synthesis
a. chromatin b. mRNA c. ribosomal subunit d. gene e. protein
Each of the following bones is part of the axial skeleton EXCEPT which one?
A) ribs B) vertebrae C) sternum D) maxilla E) clavicle