During inflammation, which of the following releases histamine?
a) eosinophil
b) mast cells
c) plasma cells
d) B cells
Answer: b) mast cells
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Which of the following is not part of a yeast artificial chromosome (YAC)?
A. a CEN sequence B. an ARS C. a selectable marker D. the F factor
The osmoregulatory and ionoregulatory problems facing a freshwater fish are
A. loss of water and loss of ions. B. loss of water and gain of ions. C. gain of water and loss of ions. D. gain of water and gain of ions. E. loss of urine and gain of ions.
Which of the following statements is TRUE?
a. Bryophytes have a short-lived sporophyte phase. b. Bryophytes lack true leaves and stems but possess true roots. c. Zygotes of bryophytes are released into the environment after their formation. d. Bryophytes do not reproduce asexually. e. Bryophytes produce male and female gametophytes that are identical in appearance.
Which of the following is a structural feature of DNA but not RNA?
A) Single-stranded B) Containing the nitrogenous base adenine C) Containing phosphate groups D) Containing deoxyribose sugars E) Containing the nitrogenous base uracil