Why do immunizations require two doses?
a. The first dose stimulates the effector cells only, and the second dose stimulates the memory cells only.
b. The first dose stimulates the primary immune response, and the second dose stimulates the secondary immune
response.
c. In case the first dose isn't enough to induce immunity, a second dose is given.
d. The first dose often is ineffective.
e. The first dose stimulates the innate immune response, and the second dose stimulates the adaptive immune
response
ANSWER: b
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In the lac operon, CAP binding to the CAP site of the promoter ____
a. occurs when glucose is present b. inhibits RNA polymerase from binding to the promoter c. occurs when cAMP is absent d. helps the repressor protein bind to the operator e. enables RNA polymerase to transcribe the operon’s genes
Imagine that you are a detective who has identified a potential suspect in a homicide. You acquire a small amount of blood from the crime scene and hand it over to your lab. The lab carries out PCR for one polymorphism, and it returns as a match to your suspect. Is this enough to arrest your suspect?
A. Yes, these data definitively prove that your suspect was at the crime scene. B. Yes, the chance that your suspect will have the same polymorphism as a drop of blood from a random individual is about 1 in 50,000?this is enough to arrest the suspect. C. No, your lab should assess additional polymorphisms?a single polymorphism does not constitute a genetic fingerprint. D. No, the small amount of blood you acquired from the crime scene will not provide enough genetic material for PCR to be carried out efficiently?more than a single drop of blood is needed to provide enough raw material for analysis.
In a well-stratified lake in summer, the subsurface layer of water, which is characterized by a steep and rapid decline in temperature with depth, is called the
A) epilimnion. B) metalimnion. C) hypolimnion. D) benthic zone.
Recombinant Dna technology is used by pharmaceutical companies to manufacture medications that cannot be maede by other means.
a. true b. false