Cri-du-chat syndrome babies are mentally challenged and have an abnormal larynx that makes sounds like the cry of a cat. This disorder is due to a/an:
A) duplication in chromosome 7.
B) trisomy 21.
C) deletion in chromosome 5.
D) translocation between chromosome 9 and 22.
E) inversion in chromosome 2.
Answer: C
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The development of septa in the hyphae of fungi was an important evolutionary step. Why?
A. If a hypha is damaged, fungi can seal septa pores to prevent cytoplasmic leakage. B. If a hypha is damaged, septa can secrete chemicals to attract symbiotic cyanobacteria. C. Septa can produce fungal spores during both sexual and asexual reproduction. D. Septa can produce different fungal mating types that aid in sexual reproduction.
Which of the following statements about methyl-directed mismatch repair systems is FALSE?
A. Methyl-directed mismatch repair systems require the concerted actions of several proteins. B. Methyl-directed mismatch repair systems require exonucleases. C. Methyl-directed mismatch repair systems are most often used to correct pyrimidine dimers. D. Methyl-directed mismatch repair systems exist in all species. E. Methyl-directed mismatch repair systems require incorrectly matched base pairs in the DNA.
Fish and crustaceans are similar in that both use _____________ for gas exchange.
A. tracheal tubes B. gills C. the walls of the mantle cavity D. the moist surface of their skin E. lungs
What do we call a lymphocyte that has never encountered an antigen?
A. Stem leukocyte B. Foreign lymphocyte C. T cell D. B cell E. Naive lymphocyte