Cyanobacteria are prokaryotes that carry out oxygenic photosynthesis like green plants; this means that ________.
A. they have two distinct photosystems
B. they produce oxygen as a by-product of photosynthesis
C. they use water as their electron source
D. All of the choices are correct.
Answer: D
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Which of the following lacks sufficient penetrating power for bulk sterilization?
A. Gamma radiation B. Ultraviolet (UV) radiation at 260 nm C. Alpha and beta particles D. X rays
Refer to the accompanying figure. What will occur when an electrical impulse travels along the neuron labeled as 2?
a. The hand will be extended. b. The hand will be withdrawn. c. The fingers will flex. d. The fingers will extend. e. The hand will remain stationary.
Fungal mycelia _____.
A. have a small surface area to prevent water loss B. are found almost exclusively in dry areas C. are found almost exclusively in aquatic environments D. have a large surface area composed of branching hyphae
Carbolfuchsin is the ________ in the acid-fast stain.
A. primary stain B. mordant C. decolorizer D. counterstain E. fixing reagent