The only flagellated cells in the human body are
A) Sertoli cells.
B) mature ova.
C) primary oocytes.
D) primary spermatocytes.
E) sperm.
E
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Serological testing always involves reactions between specific antibody and antigen.
Answer the following statement true (T) or false (F)
Which of the following best explains why not all individual aminoacyl-tRNA synthetase enzymes recognize the correct tRNA molecules through the anticodon sequence?
A. All tRNA molecules have the same anticodon sequence. B. Synthetases only contact the tRNA molecules at the 3'-terminal hydroxyl. C. More than one codon may code for one amino acid. D. There are 61 different aminoacyl-tRNA synthetase enzymes.
A unique feature of terrestrial filamentous fungi not found in aquatic fungi is
A. formation of flagellated spores that aid in spore dispersal. B. oxygen-impermeable structures including sclerotia and hyphal cords. C. mitochondria with highly invaginated cristae that permit more rapid diffusion of oxygen for oxidative phosphorylation. D. All of the choices are correct.
Which fastidious genus requires hemin (X factor) and NAD (X factor) in its growth medium?
A. Legionella B. Haemophilus C. Brucella D. Shigella E. All of the choices are correct