Repeated attacks of amoebiasis may occur because:
a. diagnostic methods are very poor
b. there are not effective treatments
c. the body's immune system does not respond
d. the protists remain in the body as cysts
d. the protists remain in the body as cysts
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Which statement is true?
a. Antibodies are bound to plasma cells. b. Antibody neutralization kills cells that have already been infected. c. Temporary immunity can be transferred between individuals. d. Complement activation occurs within neutrophils.
Some secondary metabolites are bitter or toxic. What protective effect does this have for plants?
a. protection from overexposure to UV radiation b. defense against pathogens c. long distance signaling response d. defense against herbivores
An individual with a genetic makeup of aa BB is called
a. true-breeding. b. recessive. c. hybrid. d. dihybrid. e. heterozygous
Recombination between two Alu elements results in deletions. In humans these have often been associated with specific disorders. In a recent study, researchers compared Alu recombination-mediated deletions of humans and chimpanzees
They identified 492 human-specific deletions of this type. Why is this finding important? A) It shows that humans are not as genetically close to chimpanzees as researchers previously thought. B) It shows how much the chimpanzee genome has changed since the divergence of these two lineages. C) It shows that the time of divergence of the two lineages is much older than was previously thought. D) It shows that more deletions have occurred in humans than in chimps. E) It demonstrates the importance of Alu recombination in shaping genome divergence.