The activity of which organelles helps keep the
ingestion of all but excessive amounts of ethyl
alcohol from being fatal?
a. Golgi bodies
b. vesicles
c. mitochondria
d. lysosomes
e. peroxisomes
Answer: e
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Jan Baptista van Helmont did an important experiment related to photosynthesis. He weighed a small willow tree and a pot of soil. Jan then planted the tree in the pot. Over the course of five years, he added only water to the pot. At the end of five years, he weighed the tree and found that it had gained 74.4 kg. He weighed the soil, and it was only 57 g less. What do the results of this specific experiment demonstrate about what is needed for a plant to grow and increase its mass?
A. All of the food a plant needs to grow comes from the soil. B. Plants do not need soil to grow. C. All of the food a plant needs to grow comes from the water. D. Plants must be able to increase their mass using substances in addition to what is found in soil. E. Plants need oxygen to grow.
Radioactive isotopes are biological tools that are often used to
A) measure the size of fossils. B) build up a store of calcium in a cell. C) detect brain tumors and other important medical technologies. D) increase the pH of blood.
Bacteria in the phylum Firmicutes are distinguished from the phylum Actinobacteria on the basis of
A. their Gram stain reaction. B. the high G + C content of their DNA. C. their spiral shapes. D. the low G + C content of their DNA. E. the presence of LPS in their membranes.
Which of the following statements regarding nutritive material and embryo in seeds is true?
A. In gymnosperms the female gametophyte provides food for the embryo. B. In angiosperms the female gametophyte provides food for the embryo. C. In gymnosperms the embryo is relatively small. D. In angiosperms the embryo is relatively large. E. Gymnosperms seeds do not have a seed coat.