Photorespiration is detrimental for a plant because
A) RuBP is degraded.
B) O2 is required.
C) no glucose is produced.
D) glucose is synthesized.
E) CO2 is synthesized.
C
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The Nef protein helps HIV evade the adaptive immune system by
a. destroying cytotoxic T cells. b. destroying class I MHC proteins as soon as they get to the surface of infected cells. c. destroying class I MHC proteins in the cytoplasm. d. binding to class I MHC proteins at the cell surface, thereby blocking their availability to cytotoxic T cells. e. binding to class I MHC proteins in the cytoplasm, thereby preventing their transport to the cell surface.
The digestion of proteins begins in the ____
a. stomach b. pancreas c. small intestine d. large intestine e. esophagus
The "naked" seeds of conifers develop on the shelf-like scales of the ______.
A. Microsporocyte B. Pollen cones C. Microsporangia D. Ovulate cones E. Male cones
What human activity can cause flooding along riverbanks?
A) Removal of forests and wetlands along the river B) Decreased conversion of forests to farmland C) Decreased soil formation D) Overfishing E) Increased evaporation due to fewer trees