Cyanobacteria are photortophic. Which of the following would they also be considered?
A. heterotrophic
B. autotrophic
C. chemotrophic
D. obligate anaerobes
E. aerobic
Answer: B. autotrophic
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Arrange the following five events in an order that explains the mass flow of materials in the phloem
1. Water diffuses into the sieve tubes. 2. Leaf cells produce sugar by photosynthesis. 3. Solutes are actively transported into sieve tubes. 4. Sugar is transported from cell to cell in the leaf. 5. Sugar moves down the stem. A) 2, 1, 4, 3, 5 B) 1, 2, 3, 4, 5 C) 2, 4, 3, 1, 5 D) 4, 2, 1, 3, 5 E) 2, 4, 1, 3, 5
Consider the role of hormones in plant defense to microbes. How does ethylene control the production of receptors that detect bacterial flagella?
What will be an ideal response?
Molecules that diffuse passively across the plasma membrane most rapidly are
a. small. b. hydrophobic. c. small and hydrophobic. d. small and hydrophilic.
When oxygen is present in the environment, methylene blue is ______.
A) blue B) colorless