Carbon exists in the atmosphere. It could have come from all of the following sources EXCEPT:
a) Cellular respiration by plants and animals
b) Burning of biofuels
c) Burning of fossil fuels
d) Photosynthesis by plants
d) Photosynthesis by plants
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Which of the following pairs is incorrectly matched?
A. macrophage; class II MHC protein B. B cell; class I MHC protein C. B cell; IL-2 secretion D. helper T cell; CD4 E. cytotoxic T cell; class I MHC protein
The technical name for the eardrum is the
a. tympanic membrane. b. round window. c. oval window. d. cochlear duct. e. organ of Corti
Bacteria in the ?-proteobacterial clade ________ are the most abundant organisms on Earth and demonstrate unique adaptations to life in the oligotrophic open ocean.
What will be an ideal response?
The nucleus, an organelle found in eukaryotic cells, confines the __________, keeping them separated from other components of the cell
(a) lysosomes (b) chromosomes (c) peroxisomes (d) ribosomes