Allergy is a(n) ____ response to ____ antigens
a. overactive; environmental
b. underactive; environmental
c. overactive; cellular
d. underactive; cellular
e. normal level; microbial
A
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One type of small regulatory RNA that inhibits translation of mRNAs is called ____ (miRNA)
Fill in the blank with the appropriate word.
The same hormone stimulates gene expression in one cell, but inhibits gene expression in another cell. What is the best explanation for this difference?
A. The two cells have different types of receptors for the hormone. B. The two cells receive different amounts of the hormone. C. The two cells receive the hormone at different times. D. The hormone is degraded more quickly in one cell than the other. E. The hormone can diffuse through the plasma membrane of one cell, but not the other.
In recombinant DNA technology, enzymes used to precisely cut DNA are called
a. DNA ligases. b. restriction enzymes. c. DNA polymerases. d. RNA polymerases. e. vectors.
Hemophilia is a genetic disease that has plagued the royal houses of Europe. The disease allele is recessive and X-linked. Queen Victoria was a carrier, and her granddaughter Alexandra married Nicholas II, the last czar of imperial Russia
Alexandra was a carrier for hemophilia; Nicholas was normal. Their son, Alexis, was afflicted with the disease. Alexis and his four sisters were killed in 1917. What genetic traits were possible for the four sisters? A) None of the four sisters carried the hemophilia allele. B) At least one of the sisters was a carrier of the allele. C) All four sisters were carriers of the hemophilia allele. D) At least one of the sisters had hemophilia like Alexis.