Bryophytes are able to actively control their hydration
A. true
B. false
B
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Which of the following supports the argument that viruses are nonliving?
A) They lack genetic material. B) They are not cellular. C) Their DNA does not encode proteins. D) They have RNA rather than DNA. E) They do not evolve.
For an accurate diagnostic of a current infection, acute and convalescent sera should reflect a(n) _____ in the patient's antibody titer of _____ doubling dilutions
a. decrease; two b. increase; two c. decrease; four d. increase; four
Hydrogen bonds between different parts of the polypeptide chain result in which level of protein structure?
A. primary B. secondary C. tertiary D. quaternary
Some advanced mushrooms produce club shaped cells that produce sexual spores. These structures are called
a. asci b. basidia c. zygospores d. arbuscles e. gills