You are a doctor are examining a patient whose thymus never developed because of DiGeorge syndrome
You know that this medical condition is usually due to the deletion of a
section of chromosome #22 and that a single copy of shortened chromosome causes the
syndrome. The patient's parents are both phenotypically normal with normal thymuses. This
suggests that _____________.
A. both parents are heterozygous
B. both parents are homozygous recessive
C. the individual inherited the trait from his
grandparents.
D. the deletion occurred during gamete
formation and thus was not part of the
parents' genome.
D
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Both prokaryotic and eukaryotic cells use ________ to turn certain genes on or off.
The most dangerous type of arrhythmia is
a. tachycardia. b. ventricular fibrillation. c. brachycardia. d. atrial fibrillation. e. an electrocardiogram
Where would you predict an obligate anaerobe would grow in a tube of fluid thioglycollate medium?
At or very near the surface of the broth A little below the surface of the broth Throughout the entire tube At the bottom of the tube
In performing a ten-fold dilutions series from a sample containing 10,000 bacteria per milliliter, the fourth tube in the dilution series will have 10 cells per milliliter
Indicate whether the statement is true or false