The pathogen that causes Legionnaires'pneumonia also causes a milder infection called Pontiac fever.
a. true
b. false
a. true
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Ferns are particularly useful for research on plant growth and development because of the ____
a. numerous, large apical cells on the edges of their fronds b. single, large apical cell on the tip of their fronds c. single, large apical cell at the tip of their apical meristems d. numerous, small apical cells at the base of their apical meristems e. single, small apical cell at the base of their apical meristems
The first cells evolved approximately ________ years ago
a. 2.7 billion b. 2.2 billion c. 5 billion d. 3.8 billion e. 3.2 billion
What are the final electron acceptors for the electron transport chains in the light reactions of photosynthesis and in cellular respiration?
a. O2 in both b. CO2 in both c. H2O in the light reactions and O2 in respiration. d. P700 and NADP+ in respiration e. NADP+ in the light reactions and O2 in respiration in the light reactions and NAD+ or FAD
Nodes of Ranvier is the axonal area where lacks the insulation of myelin sheets of (i) _______________. The structure contributes to efficient propagation of axon potential due to the localization of highly concentrated (ii) _______________.
a) (i) oligodendrocyte or Schwann cell, (ii) K+ channel b) (i) astrocyte (ii) voltage gated Na+ channel c) (i) astrocyte (ii) K+ channel d) (i) oligodendrocyte or Schwann cell, (ii) voltage gated Na+ channel