Ions carrying a positive charge are cations
Indicate whether the statement is true or false
TRUE
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Suppose you wanted to investigate ideas on how polymerization of prebiotic organic molecules may have occurred on the early Earth, which of the following scenarios might best be utilized for this?
A. Mix some RNA nucleotides in water and heat them to boiling temperatures. B. Mix some amino acids (protein building blocks) in water and add a strong acid or a strong base. C. Mix some RNA nucleotides in water and repeatedly wet and dry them on clay. D. Mix some amino acids (protein building blocks) in water and add a bacterium harmless to humans. E. Mix some amino acids in salt water and cool down to 0C.
Why would the Sabin oral polio vaccine need to be eliminated as we get closer and closer to eradication of the polio virus?
A. Since it is a live, attenuated viral vaccine, there's always the chance it could revert back into a pathogenic state by mutation. This would introduce new strains still capable of causing the illness into human populations, thwarting elimination. B. The Sabin vaccine is cheaper than the Salk (killed virus) vaccine, but it isn't as effective at producing a protective response. We'll need to shift to the more effective Salk vaccine worldwide eventually to complete the eradication process. C. The Salk vaccine is far cheaper than the Sabin vaccine. To effectively eradicate polio, we'll need to shift all of our resources into the cheapest and easiest to deliver vaccine possible. That is the Salk vaccine. D. The Sabin vaccine can only be administered to human beings. We need to vaccinate bird populations as well to effectively control the spread of polio. Birds are a natural reservoir for the virus.
Which of the following RNA strands is complementary to the DNA sequence 5'–ATCGATCG–3'?
A. 3'–UAGCUAGC–5' B. 5'–UAGCUAGC–3' C. 3'–TAGCTAGC–5' D. 5'–TAGCTAGC–3' E. 3'–AUGCAUGC–5'
Several cases of nonbloody diarrhea with nausea, fever, and abdominal pain have occurred among a number of people who ate at the same restaurant. Public health officers find a food sample containing motile noncoliform, Gram-negative bacteria capable of metabolizing glucose. The "food poisoning" resulted from contamination with:
A) Yersinia B) E. Coli C) Citrobacter D) Shigella E) Salmonella