What event initiates development?
A. fertilization
B. cleavage
C. gastrulation
D. organogenesis
A. fertilization
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An excess of synonymous to non-synonymous differences the FoxP2 sequence of humans relative to the FoxP2 sequence of chimpanzees implies that:
A. FoxP2 is a highly conserved transcription factor. B. The function of FoxP2 has been under positive selection in the human lineage but that the expression pattern of FoxP2 has not. C. The expression pattern of FoxP2 has been under positive selection in the human lineage but that the function of FoxP2 has not. D. The function of FoxP2 has been under positive selection in the human lineage. No inferences regarding the effect of positive selection acting on the expression pattern of FoxP2 are possible based on these data.
Fatal familial insomnia(FFI) is a very rare prion disease of the brain. FFI has no known cure and involves progressively worsening insomnia, which eventually leads to hallucinations, delirium, and dementia-like symptoms. The average age of diagnosis is about 40 years of age and the average life span after diagnosis is 18 months. FFI is not caused by an infection, but is inherited in an autosomal dominant fashion. Knowing its inheritance pattern AND knowing it is a prion disease, which of the following is accurate?
A. Individuals with FFI have inherited a gene that encodes a mutant form of a prion protein that folds abnormally. B. The abnormal prion protein gradually converts the normal prion proteins of the brain into abnormal prion proteins. C. The abnormal proteins do not get degraded and they form aggregates in brain cells. D. An individual who inherits one copy of the mutant allele will show the FFI phenotype. E. All of these are correct.
Most allergy medicines contain antihistamines that block the actions of histamine. These drugs reduce cold symptoms by directly
A. lysing virus-infected cells and preventing further propagation of the pathogen. B. stimulating components of the immune system through the release of cytokines. C. blocking or reducing the inflammation response in mucous membranes. D. stimulating the production of specific antibodies. E. recruiting macrophages to the nasal epithelium.
A(n) ________ is a virus that infects bacterial cells
A) virion B) prion C) bacteriophage D) nucleocapsid E) envelope