When under attack, ciliates can eject dart-like protein threads from surface organelles called
a. vacuoles.
b. gullets.
c. trichocysts.
d. phagosomes.
e. alveoli.
C
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Of the following steps associated with translation, which does not involve hydrolysis of GTP?
A) aminoacylation of tRNA B) formation of the initiation complex C) binding of the aminoacyl tRNA to the codon at the A site D) translocation of the ribosome E) release of polypeptide
Approximately how many single nucleotide polymorphisms have been identified in humans?
a. 10s b. 100s c. 1000s d. 100,000s e. 1,000,000s
Indirect interactions can be either positive or negative for the affected species
Indicate whether the statement is true or false
A series of events occur during fertilization. Place the following events in the proper order in which they occur. a) The "slowblock" occurs. b) A single nuclear envelope surrounds both sperm and egg pronuclei. c) The acrosomes of sperm release digestive enzymes that allow the sperm to pass through the zona pellucida to the egg plasma membrane. d) Sperm cover the surface of the egg and secrete enzymes that help weaken the corona radiata. e) Pronuclei are formed. f) The "fast block" occurs. g) Microvilli bring the entire sperm into the egg. h) Sperm squeeze through the corona radiata and bind to the zona pellucida.
A. a, e, b, d, f, c, g, h B. d, b, g, a, f, c, e, h C. f, a, d, h, c, g, e, b D. e, d, h, c, a, f, b, g E. d, h, c, f, a, g, e, b