Mutation of the adenosine deaminase gene is the cause of what genetic disease?
A) Cystic fibrosis
B) Albinism
C) Down syndrome
D) Severe combined immunodeficiency
E) Acquired immune deficiency
D
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For growth, most bacteria require water activity levels above
A. 1.00. B. 0.80. C. 0.70. D. 0.90.
Cells carry out three major types of work; which of the following involves energy for cell motility and the movement of structures within cells?
A. Chemical work B. Mechanical work C. Transport work D. None of the choices are correct.
Which of the following is an organism that
possesses chaetae and nephridia and exhibits coordinated movements of circular and longitudinal muscle? a. millipede b. tapeworm c. polychaete d. hookworm e. flatworm
Sea urchins and jellyfish are both radially symmetrical, but sea urchins and humans are much more closely related than sea urchins and jellyfish. Why is this true?
A. Sea urchins have bilaterally symmetrical larvae and exhibit radial cleavage. B. Humans are descendents of sea urchins not jellyfish. C. Jellyfish have bilaterally symmetrical, triploblastic larvae. D. Humans are radially symmetrical during most of their embryonic development.