Fill in the blanks to complete the following statements
_________________ is a pneumonia-like infection associated with patients on ventilators. ?
Fill in the blank(s) with correct word
Tracheobronchitis
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The hearts of a fetal pig and a human are similar in that they are
a. the primary pump of the circulatory system of the body. b. both four chambered. c. composed of cardiac muscle tissue. d. all of the above.
Bacteria cannot be classified using the biological definition of a species for which reason?
A. The DNA sequences of all bacteria are more than 97% identical. B. Bacteria cannot reproduce. C. Bacteria are present everywhere and cannot be reproductively isolated from other bacteria. D. Bacteria are asexual. E. Bacteria do not evolve.
Mutations are regarded as a strong evolutionary mechanism for changing allelic frequencies
Indicate whether the statement is true or false
Nitrogen is the most abundant element in the atmosphere, and a crucial component of proteins, vitamins, and nucleic acids. However, plants and other producers cannot use nitrogen in its natural form (N2)
Nitrogen has to undergo a process called nitrogen fixation. What does this process involve? A) It is the synthesis of ammonia from nitrogen gas by certain bacteria. B) Nitrate is converted to ammonia. C) Ammonia is converted to nitrate. D) It is undertaken by denitrifying bacteria. E) Nitrogen is accumulated in dead organic matter.