Which of the following is the best definition of polyploidy?
a. the variety of forks in an evolutionary tree
b. the acquisition of multiple copies of each chromosome
c. multiple speciation events that occur rapidly
d. an event caused by genetic divergence
Answer: b. the acquisition of multiple copies of each chromosome
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Which of the following statements about transcriptional regulation is incorrect?
A. Regulatory transcription factors are proteins that bind to enhancer DNA sequences and then recruit one or more general transcription factors. B. A typical gene contains only one enhancer sequence. C. General transcription factors are required to initiate the process of transcription. D. General transcription factors bind to the TATA box in the promoter region of a gene. E. RNA polymerase components are recruited to the promoter region by the general transcription factors bound to the TATA box.
A blanket from a child with chickenpox is likely to be contaminated with the virus that causes chickenpox (Varicella-zoster virus). What is the blanket called?
A) fomite B) host C) pathogen D) vector
A fistula is a crater-like lesion in the skin or mucous membrane.
a. true b. false
________ occurs when 50% of a protein produces a different phenotype than that produced by 100% or 0% of the protein.
A. Recessive inheritance B. Codominance C. Hybridization D. Loss of function mutation E. Incomplete dominance