Which part of the sperm cell contains enzymes to help the sperm digest a pathway into the egg?
A. centriole
B. acrosome
C. body
D. head
E. tail
Answer: B
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Which group's members have both lungs and gills during their adult lives?
A) sharks, skates, and rays B) lungfishes C) lancelets D) turtles E) alligators
To test the validity of TSI media, quality control should be performed using which two organisms?
a. Gardnerella and Lactobacillus b. Erysipelothrix and Gardnerella c. Propionibacterium and Lactobacillus d. Actinomyces and Arcanobacterium
Plants cannot __________ in the dark
a. grow b. respire c. move d. utilize chlorophyll e. sense light
________ are toxic proteins secreted by pathogenic bacteria, and ________ are toxic components of the outer membrane of gram-negative bacteria
A) Endotoxins; parasites B) Endotoxins; botulinum toxins C) Exotoxins; enterotoxins D) Exotoxins; endotoxins