In what system does the acidic pH prevent pathogenic infections?
a. urinary
b. respiratory
c. endocrine
d. hepatic
e. cardiovascular
ANSWER: a
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Which of the following blood cells fights infections?
A) Red blood cells B) Platelets C) White blood cells D) Hemoglobin
Eukaryotic mRNAs are modified by addition of a poly(A) sequences at the 3' end and 7-methyl guanosine at the 5' end.
Answer the following statement true (T) or false (F)
Based on the pollen to ovule ratios, which statement appears to be true?
a. Species A probably distributes its pollen via the wind. b. Species B probably distributes its pollen via the wind. c. The pollen from species B is probably distributed by animals. d. Both species probably distribute their pollen via the same method
The megaspore produces a gametophyte with ____ cells
a. 2 b. 7 c. 8 d. 14 e. 16