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Chapter 22: Q. 16 (page 570)
Which of the following elements is not a micronutrient?
a. boron
b. calcium
c. chromium
d. manganese
The one which is not a micronutrient is calcium.
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Farmers continually rotate the crops grown in different fields to maintain nutrients in the soil. How would planting soybeans in a field the year after the field was used to grow carrots help maintain nitrogen in the soil?
Cyanobacteria harness energy from the sun through photosynthesis, and oxidize water to provide electrons for energy generation. Thus, we classify cyanobacteria as _________.
a. photolithotrophs
b. photoautotrophs
c. chemolithoautotrophs
d. chemo-organotrophs
The presence of a membrane-enclosed nucleus is a characteristic of ________.
a. prokaryotic cells
b. eukaryotic cells
c. all cells
d. viruses
Researchers have discovered that washing spinach with water several times does not prevent foodborne diseases due toE. coli. How can you explain this fact?
Prokaryotes that obtain their energy from chemical compounds are called _____.
a. phototrophs
b. auxotrophs
c. chemotrophs
d. lithotrophs
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