Defects in bone marrow stem cells result in a condition known as
A. SCID.
B. AIDS.
C. Di George's syndrome.
D. Chediak-Higashi disease.
A
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Methane is a significant part of the carbon cycle in ________ environments dominated by methanogens.
A. thermophilic B. autotrophic C. anaerobic D. oligotrophic
A genes expressed at a relatively constant level in tissues regardless of variations in the animal's condition is called a
A. transposable element. B. steady state gene. C. constitutive gene. D. recombinant gene. E. multifunctional gene.
The Hardy Weinberg equation tells us what to expect if a population is
1.not evolving. 2.migrating. 3.evolving. 4.not reproducing. 5.mutating.
The respiratory centers that control ventilation of the lungs in mammals are located in the
A. brainstem. B. bronchi. C. hypothalamus. D. neck. E. cerebral cortex.