Why is photosynthesis a coupled reaction?
A) Photosynthesis requires two reactants: carbon dioxide and water.
B) Sunlight energy enters a plant and is ultimately lost as heat.
C) The exergonic reaction occurs in the plant, and the endergonic reaction occurs in the sunlight.
D) The exergonic reaction occurs in the plant, and the endergonic reaction occurs in the soil.
E) An exergonic reaction occurs in the sunlight, and an endergonic reaction occurs in the plant.
E
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Choose the option that places the following events in plant defense in the correct order:
1. Plant cell recognizes double-stranded RNA (dsRNA) as foreign and cleaves it into fragments. 2. Single-stranded RNA (ssRNA) molecules bind to the protein-bound small interfering RNA (siRNA) and are destroyed. 3. A virus infects the host plant, injecting ssRNA into the cell. 4. Viral genome is replicated and dsRNA molecules are formed. 5. siRNA bind to a plant protein complex, which retains only one of the RNA strands. A. 3 2 1 4 5 B. 1 2 4 3 5 C. 5 3 4 2 1 D. 1 2 3 4 5 E. 3 4 1 5 2
Loams are soils with the best water and oxygen
penetration because they have a. a high proportion of sand. b. a high proportion of silt. c. a high proportion of clay. d. high proportions of sand and silt and a low proportion of clay. e. equal proportions of sand, silt, and clay.
Down syndrome is associated with
a. mental retardation. b. abnormal skeletal development. c. weak muscle reflexes. d. slowly developing motor functions. e. all of these.
Charlene loved to eat raw garlic in various dishes. She didn't notice any strong smell, so she couldn't understand why others didn't want to be around her. What sensory phenomenon is she demonstrating?
A) sensory adaptation B) action potentials C) receptor potentials D) accommodation