The most common etiologic agent of lower respiratory tract infection among adults younger than 30 years of age is:
a. Chlamydophila pneumoniae.
b. Mycoplasma pneumoniae.
c. Streptococcus pneumoniae.
d. Haemophilus influenzae.
B
The most common agent of lower respiratory tract infection among young adults is M. pneumo-niae, which is transmitted via close contact.
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Which statement is true of embryonic splitting?
a. It never occurs in nature. b. It involves the genetic contribution of only one parent. c. It produces immediate differentiation. d. It is applied in animal husbandry to produce genetically diverse offspring. e. It produces identical twins.
The widening of a tree trunk is mostly due to the activity of its
A. apical meristem. B. secondary phloem. C. vascular cambium. D. primary xylem
Which of the following is an example of a respiratory surface?
a. fish fins b. human nose c. reptilian skin d. human lungs
Which type of lipid is most important in biological membranes?
A) Wax B) Steroid C) Phospholipid D) Fat E) Oil