Which of the following types of microscopy could be used to visualize the layers of the cell membrane and the cell wall?
A) phase-contrast microscopy
B) transmission electron microscopy
C) bright-field microscopy
D) confocal microscopy
Answer: B
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Homeotic genes code for
a. enzymes. b. translation enhancers. c. transcription factors. d. both enzymes and translation enhancers. e. both translation enhancers and transcription factors.
The calcium-rich remains of protists are now found
a. in sea floor sediments. b. in limestone rock formations. c. in the white cliffs of Dover, England. d. in the Egyptian pyramids. e. in all of these places.
Who first proposed the concept that simple organic molecules could form spontaneously from simpler raw materials?
a. Miller and Urey b. Charles Darwin c. Thomas Malthus d. Watson and Crick e. Oparin and Haldane
Which of the following is/are common to chemiosmosis and the light-dependent reactions of photosynthesis?
A) reduction of NADP+ only B) electron transport only C) a proton gradient only D) both electron transport and a proton gradient E) electron transport, a proton gradient, and reduction of NADP+