About 80% of all land plants, including grasses, shrubs, and trees, form mycorrhizae. Mycorrhizae are best described as
A. parasitic associations between fungi and plant leaves.
B. balanced competitive associations between plants and fungi.
C. mutualistic associations between fungi and plant roots.
D. parasitic associations between fungi and plant roots.
E. mutualistic associations between fungi and plant leaves.
C. mutualistic associations between fungi and plant roots.
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Determinate cleavage takes place in __________ and is characterized by a pattern of development
where the ultimate fate of each cell is __________. a. protostomes; not fixed until late in the developmental process b. protostomes; fixed early in the developmental process c. deuterostomes; not fixed until late in the developmental process d. deuterostomes; fixed early in the developmental process e. coelomates; fixed early in the developmental process
The enzyme salivary amylase in the mouth breaks down starch into the simple sugar glucose. The mouth has a pH of 7. Salivary amylase will
A. also break down starch in the stomach, which has a pH of 2. B. be able to break down proteins to amino acids in the stomach. C. be able to break down starch in a test tube. It doesn't need to be in the mouth. D. only work at body temperature.
Severe acute respiratory syndrome (SARS) has what characteristic structures when visualized under an electron microscope?
a. Glycoprotein spikes b. Crownlike surface projections c. Filamentous structures d. Shepherd's hook
The abundant protein in blood, which is arguably the most critical for oxygen homeostasis in the body, is
A. myoglobin. B. actin. C. fibrinogen. D. hemoglobin. E. myosin.