If a patient lacks B cells, the resulting disease is
A. SCID.
B. AIDS.
C. Di George's syndrome.
D. agammaglobulinemia.
D
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The actual transport of protons by the proton pump is mediated by a transmembrane protein which undergoes a change in its
A. conformation. B. amino acid sequence. C. net charge. D. solubility. E. immunity.
Which cell feature is absent in bacterial cells?
a. ribosomes b. cytoplasm c. nucleoid d. nucleus e. DNA
Which step in making beer involves sprouting and softening the barley to release amylases to act on starch and proteases to digest protein?
A. Preparing a mash B. Fermentation C. Wort boiled with hops D. Aging E. Malting
Which one of the following is NOT considered to be one of the macronutrients needed by plants?
A. manganese B. nitrogen C. phosphorus D. sulfur E. potassium