Answer the question using the accompanying figure. The mass number of the atom depicted in the figure is ____
a. 4
b. 6
c. 8
d. 12
e. 18
ANSWER: d
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Movable DNA sequences are called
A. transposable elements. B. frameshifts. C. transitions. D. centromeres. E. telomeres.
While doing a pedigree analysis of a royal family from the ancient Mayan empire, you notice that a prince with the genetic disease married a person from outside the royal family without a history of the disease in her family
Of their six children, two have the disease and four are not affected. The prince's mother and his father also had this disease. If this disease is controlled by a single gene, then the most likely explanation for disease in the children would be: A. the disease is a spontaneous mutation. B. the disease is recessive and is only seen in homozygous recessive individuals such as the two affected children. C. the disease is dominant and is only seen in homozygous dominant individuals. D. the disease is dominant and is seen in heterozygous or homozygous dominant individuals.
A muscle fiber contracts by a sequence of events initiated by the binding of acetylcholine to its receptor. Which of the following is the correct sequence?
I-The calcium-troponin complex pulls tropomyosin away from the myosin binding sites of actin. II-The freed-sites of actin bind to myosin to form cross bridges. III-Calcium ion binds to the troponin. A. II, III, and I B. III, II, and I C. III, I, and II D. I, III, and II E. I, II, and III
Dynein is a molecular motor that:
a. Moves cargo to the plasma membrane b. Moves cargo to the actin filaments c. Moves cargo to the centrosome d. Acts as an actin filament e. None of the above