Which of the following is not a function of the Drosophila Sxl protein?
A. prevention of the splicing machinery from recognizing the splice junctions of the E1 or L3 exons of the Sxl mRNA
B. mediation of alternative splicing that produces transcripts for functional Tra protein
C. binding specifically to the regulated 3' splice site of the tra transcript
D. mediation of the splice variant of the dsx transcript leading to repression of female-specific genes
D
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Different alleles that are both expressed in a heterozygote are
A) dominant. B) codominant. C) incompletely dominant. D) homozygous dominant.
What is the nature of the genetic mutation that causes lactose intolerance?
A. It is a dominant mutation that prevents lactase production. B. It is a dominant mutation that causes a decline in adult lactase levels. C. It is a recessive mutation that prevents lactase production. D. It is a recessive mutation that causes a decline in adult lactase levels. E. It is an X-linked mutation that prevents lactase production.
Acanthamoeba and (Entamoeba/Naegleria/Plasmodium) cause rare and usually fatal infections of the brain
What will be an ideal response?
Superantigens
a. activate more T cells than normal. b. activate more B cells than normal. c. bind to MHC molecules outside of the normal antigen binding site. d. do all of the above. e. are characterized by a and c.