You are a doctor examining a patient whose thymus is underdeveloped because of a medical condition called DiGeorge syndrome. What concerns do you have about this patient's
A. The level of antigens in the blood will have
decreased.
B. Cell-mediated immunity will have
weakened.
C. The possibility of autoimmune diseases
will have increased because T cell maturation
will be affected.
C
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Deep-sea fish with large mouths use this adaptation to:
a. take chucks of meat off of larger predators probing the deep ocean in search of food. b. threaten other competitors. c. swallow almost anything that comes their way. d. store their large teeth. e. filter-feed on plankton.
A urine specimen from a maternity patient with the complaint of cystitis was received in the laboratory. The culture of this sample grew a lactose-positive, gram-negative bacillus that was presumptively identified as Escherichia coli. On differential and selective media this organism would demonstrate which reaction?
A. Hektoen Enteric Agar- green/colorless with black centers B. MacConkey Agar= colorless colonies C. Xylose-lysine Desoxycholate Agar= yellow colonies D. Xylose-lysine Desoxycholate Agar = Colorless colonies
The molecule below is a(n)
A. amino acid.
B. carbohydrate.
C. lipid.
D. nucleic acid.
Chloroplasts and mitochondria are thought to be of prokaryotic origin. One piece of evidence that supports this hypothesis is that these organelles contain prokaryotic-like ribosomes. These ribosomes are probably most similar to ribosomes found _______.
Fill in the blank(s) with the appropriate word(s).