The palatine tonsils arise from which of the following structures?
A. Pharyngeal Arch I
B. Pharyngeal Arch II
C. Pharyngeal Cleft III
D. Pharyngeal Pouch II
E. Pharyngeal Pouches III and IV
Answer: D. Pharyngeal Pouch II
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Which of the following structures allows a bacterium to propel itself through its environment?
a. microfilaments b. intermediate filaments c. microvillus d. flagellum e. microtubule
Please place the following events in transcription in the correct order.
A.) RNA polymerase binds to the promoter region just upstream of the gene. B.) RNA polymerase moves along the template strand of DNA adding complementary RNA nucleotides, extending the mRNA. C.) RNA polymerase unwinds the DNA at the promoter site and begins to transcribe the template strand of DNA. D.) The mRNA transcript is released. E.) Transcription continues until a terminator site in the DNA is reached.
Two similar-sized animal cells are placed in a 0.5% sucrose solution. Cell A enlarges for a while and then stops; cell B continues to enlarge and finally ruptures. Which of the following must have been TRUE at the beginning of the experiment?
A) Cell A has a higher concentration of sucrose than cell B. B) Cell A was hypotonic to the solution, and cell B was hypertonic. C) Cell B has a higher concentration of sucrose than cell A. D) Cell A was hypertonic to the solution, and cell B was hypotonic. E) Cells A and B were isotonic to each other.
Which feature of a 15q deletion is present in both Angelman syndrome and Prader-Willi syndrome?
A. Light skin, eye, and hair coloring B. Continuous smiling and jerky gait C. Excessive appetite and weight gain D. Progressive tremors and seizure activity