Who first performed vaccinations by inoculating children with cowpox virus to provide immunity against smallpox?
A) Milkmaids B) Edward Jenner C) Lady Montague D) Louis Pasteur
B
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In a chemical reaction, the standard free energy change (?G°') is calculated to be ?3.67 cal/mol. What can be said of the chemical reaction?
A) The reaction is at equilibrium under standard conditions. B) The reaction is spontaneous under standard conditions. C) The reaction is not spontaneous under standard conditions. D) Reactants predominate over products at equilibrium under standard conditions. E) There can be no reaction.
Kelp is a type of algae in a complex ecosystem off the Pacific coast of North America. If kelp forests shrunk in size or vanished, many other species would be affected. Kelp are ____ species in this ecosystem.
a) excluded b) keystone c) competitive d) predator
A lizard's bobbing dewlap (a colorful flap of skin hanging from an Anolis lizard's throat) is an example of a(n) _____
A) stimulus B) reflex C) signal D) innate releasing mechanism E) structure necessary for respiration
Which of the following is true of purines?
A) Cytosine is a purine. B) Adenine's bonding to thymine is stronger than is guanine's to cytosine. C) Purines have a double-ringed structure. D) Both adenine and thymine are purines. E) Purines bind readily to deoxyribose but not to ribose.