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

Biology & Microbiology

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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

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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.

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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.

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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.

Biology & Microbiology