The sequence of DNA on each chromosome where the sister chromatids are held together is called the

a. centrosome.
b. kinetochore.
c. centromere.
d. centriole.


Answer: c. centromere.

Biology & Microbiology

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The amniotes differ from the amphibians in that they

a. have efficient kidneys. b. have a waterproof skin. c. have internal fertilization. d. have a shelled amniotic egg. e. include all of these.

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Telomerase is an enzyme characteristic of normal cells that is active in DNA repair; most cancer cells have been found to lack telomerase

Indicate whether the statement is true or false

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Certain nutrients are considered "essential" in the diets of some animals because _____

A) only those animals use those nutrients B) these animals are not able to synthesize these nutrients C) the nutrients are necessary coenzymes D) only certain foods contain them

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A young patient presents with a cyst anterolateral neck, just below the jaw. Which of the following is a possible diagnosis and its associated embryological defect?

A. Cervical/Pharyngeal Cyst: Pharyngeal Arch II failed to grow over Pharyngeal Arches III and IV B. Cleft palate: Palate failed to fuse at the midline C. DiGeorge Syndrome: Failure of neural crest cell migration D. Edema secondary to poor lymphatic development in the neck E. Treacher-Collins Syndrome: Malformations of the structures formed by Pharyngeal Arches I and II

Biology & Microbiology