The diplomonads and parabasalids are unique among eukaryotes in that __________.
a. they lack double membranes around their nuclei
b. they lack ribosomes
c. they lack plastids
d. they were an early branch from bacteria rather than from archaea
e. they have highly reduced mitochondria and obtain energy anaerobically
Answer: e. they have highly reduced mitochondria and obtain energy anaerobically
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Consider conjugation in Escherichia coli. In which of the following matings would chromosomal genes be transferred most frequently?
A) F+ × F- B) F- × F- C) Hfr × F- D) Hfr × F+
Enlargement of lymph nodes or spleen is often associated with
A. tularemia. B. brucellosis. C. plague. D. gastritis. E. tularemia, brucellosis AND plague.
Which pairing between evolutionary evidence and a biological discipline is NOT correct?
a. pesticide resistance: historical biogeography b. forelimbs of all four legged vertebrates are homologous: comparative morphology c. short tails of African and Asian monkeys: historical biogeography d. gill pouches in embryos of four-limbed vertebrates: comparative embryology e. species on islands often resemble species on the mainland: historical biogeography
Electron transport chain What is released at each step of an electron transport chain?
a) ultraviolet wavelengths b) electrons c) photons d) energy e) All answers are correct.