Which of the following statements about the types and subtypes of the influenza (flu) virus is false?
A. The A(H2N2) and the A(H3N2) strains of the virus require different vaccines.
B. Genetic recombination between flu strains from different species is common.
C. High mutation rates create more diversity in strains of flu than does genetic recombination.
D. Flu subtype is determined by the kinds of proteins representing the H and N protein spikes making up the capsid of the virus.
E. Of the three major types of flu virus (A, B, and C), only Type A can occur in humans, other mammals, and birds.
Answer: B
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A. true B. false
The antiparallel arrangement within DNA molecules refers to
A. a purine always bonding to a pyrimidine. B. each base bonding at the 1' position of the sugar. C. one helix strand that runs from the 5' to 3' direction and the other strand runs from the 3' to 5' direction. D. an original parent DNA strand and one newly synthesized DNA strand comprising a new DNA molecule.
During a particularly slow afternoon in the lab, you and your colleagues decide to play another round of Whose Heart Is This? The heart you are given has a pair of atria, but only a single, undivided ventricle. What type of animal did this heart belong to before it was given to you?
a. fish b. reptile c. amphibian d. mammal
The closest relatives of the familiar pine and spruce trees are _____
A) ferns, horsetails, lycophytes, and club mosses B) hornworts, liverworts, and mosses C) gnetophytes, cycads, and ginkgos D) elms, maples, and aspens