Hemophilia A is an X-linked recessive disorder. If a normal man marries a woman who is a carrier, what fraction of their sons will have hemophilia?
A. 0%
B. 75%
C. 100%
D. 25%
E. 50%
E. 50%
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Which of the following is a characteristic of microRNAs (miRNAs)?
A. MicroRNAs are short RNA molecules. B. MicroRNAs silence the expression of specific mRNAs. C. MicroRNAs are found in plants and animals. D. MicroRNAs are cut by an enzyme called dicer. E. All of the choices are correct.
The molecule of the extracellular matrix of animal cells that is associated with joint lubrication and friction reduction is
A) glycosaminoglycan. B) proteoglycan. C) hyaluronate. D) pectin. E) fibronectin
System cell biologists often work with _______ to develop models of cellular processes that can be
refined by experimental validation.
a. molecular biologists b. reduction scientists c. the membrane d. mathmaticians e. mathmaticians and computer scientists
A heartbeat begins in the
A. atrioventricular valve. B. atrioventricular node. C. sinoatrial node. D. right ventricle. E. left atrium.