What type of electric charge do protons carry?
A) negative
B) positive
C) neutral
D) no charge
B
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Which of the following statements is FALSE?
A) When plant cells are growing, they release expansins, which are enzymes that can expand the primary cell wall. B) The secondary cell wall often contains structural components, like lignin, that form a relatively rigid and complex network within the cell wall. C) A plant cell continues growing after the secondary cell wall forms but stops growing with the formation of the tertiary cell wall. D) Pectin is a component of the cell wall that attracts and holds water.
Speed
What will be an ideal response?
Echinoderms in their larval state have _____.
a) triangular symmetry b) radial symmetry c) hexagonal symmetry d) bilateral symmetry
Which one of the following diseases of the gastrointestinal system is transmitted by the respiratory route?
A) staphylococcal enterotoxicosis B) mumps C) Vibrio gastroenteritis D) bacillary dysentery E) traveler's diarrhea