Which is NOT a chromosomal aberration?
a. deletion
b. extra chromosomes
c. translocation (exchange of parts between nonhomologs)
d. crossing over
e. fewer chromosomes
D
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A double-stranded DNA molecule contains a total of 120 purines and 120 pyrimidines. This DNA molecule could be composed of _____
A) 120 adenine and 120 uracil molecules B) 120 thymine and 120 adenine molecules C) 120 cytosine and 120 thymine molecules D) 120 adenine and 120 cytosine molecules E) 120 guanine and 120 thymine molecules
The amniotes include (select all that apply)
A. sharks B. amphibians C. reptiles D. birds E. mammals
Which of the following statements about the peripheral nervous system is NOT correct?
A. The nerves contain nerve fibers which are bundles of axons. B. The nerves contain the cell bodies of the neurons. C. The somatic nervous system sends motor impulses to the skeletal muscles. D. Effectors include the muscles that carry out the instructions sent from the central nervous system. E. Cranial and spinal nerves are part of the peripheral nervous system.
Each of the following is an effect of complement activation EXCEPT
A) interference with viral replication. B) bacterial cell lysis. C) opsonization. D) increased phagocytic activity. E) increased blood vessel permeability.