Spina bifida is one of the most prevalent of human birth defects. The defect usually involves the spinal cord or the spinal canal opening to the outside of the body. Spina bifida results from problems during the formation of the _____
A) neural tube
B) gastrula
C) notochord
D) somites
E) blastula
Answer: A
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The role of an interneuron is to:
A. relay information from sensory to motor neurons. B. convey information from the internal environment of an organism. C. stimulate a muscle to contract. D. maintain homeostasis.
What technique can help identify a disease gene quickly by narrowing the focus?
A) Compare the genome sequences of different species to identify conserved amino acids B) Filter the results to include only common polymorphisms C) Determine genotypes of parents and children at all SSR loci D) Use microarrays to identify silent mutations
Which of the following conditions is characterized by a karyotype with 45 chromosomes?
a. Turner syndrome b. Down syndrome c. testicular feminization syndrome d. Klinefelter syndrome e. cri-du-chat
Viral envelopes are composed of ________.
A. lipids B. carbohydrates C. proteins D. All of the choices are correct.