Epinephrine is secreted by
a. pancreatic islet cells.
b. the thyroid gland.
c. the pituitary gland.
d. the adrenal medulla.
e. the adrenal cortex.
D
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According to bacterial abundance studies done so far on soils, the ________ represent the most abundant phylum
A) Proteobacteria B) Acidobacteria C) Actinobacteria D) Firmicutes
A source of gamma radiation is
A) plutonium and cesium isotopes. B) alpha and beta globin. C) uranium and radium. D) carbon-14 and strontium-70.
In which cellular organelle do the three posttranscriptional modifications often seen in the maturation of mRNA in eukaryotes occur?
A) lysosome B) Golgi C) cytoplasm D) nucleus E) mitochondrion
Fungi and plants are similar because they both
A. carry out photosynthesis. B. have cellulose as the main component of their cell walls. C. have glycogen as the main storage carbohydrate. D. All answers are correct. E. have cell walls.