The process by which related species become more different in order to reduce competition is called ___________ _________.
Fill in the blank(s) with the appropriate word(s).
character displacement
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A(n) ________ gene is a gene that encodes a protein that is easy to detect and assay
A) encoder B) translational C) reporter D) recorder
T-cell receptors can only recognize antigens on the surfaces of antigen-presenting cells; they cannot bind free antigen.
Answer the following statement true (T) or false (F)
Answer the following statements true (T) or false (F)
1. DNA helicase and topoisomerase are similar insofar as they promote the unwinding and uncoiling of DNA. 2. If the sequence for one strand of DNA is 3?-TCGATT-5? then its complementary strand would have a sequence of 3?-AGCTAA-5?. 3. Okazaki fragments are sequences of DNA most often found on the lagging strand of DNA during DNA replication. 4. The progressive shortening of telomeres in DNA correlates with cell senescence.
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.