Which of the following statements about eosinophil function is CORRECT?
A. They produce defensins.
B. They secrete toxins onto virally infected cells.
C. They are involved in the removal of neoplastic cells.
D. They attach to the surface of parasitic helminths and release toxins that kill the parasite.
E. They identify and spare normal cells.
Answer: D
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Preimplantation genetic diagnosis (PGD) screens ________ for genetic disorders.
A) oocytes B) spermatocytes C) polar bodies D) early embryos
For which of the following reasons does nucleotide excision occur?
a. to repair thymine dimers b. to replace proteins c. to correct a faulty base d. to form a replication fork
Parents with the dominant phenotype cannot have offspring with the recessive phenotype.
A. False, because both parents could carry the recessive allele. B. True, because the dominant gene must be passed down from each parent. C. False, because one parent could carry the recessive allele. D. True, because at least one dominant gene will be passed down from each parent. E. True, because both parents have the dominant allele.
Which of the following is one way in which the environment may play a role in development?
a. The environment changes the segments in which Hox genes are expressed. b. The presence or absence of neural crest cells in different species is environmentally deter-mined. c. The environment directly induces gene duplications d. Environmental conditions may change the timing of developmental changes.