List the steps associated with the pressure-flow model of phloem transport.
What will be an ideal response?
1. Sugars are produced in the source (leaves) by photosynthesis.
2. Sugar is actively transported into the sieve tubes.
3. Water moves into the sieve tubes by osmosis.
4. Sugar and water mix to form phloem.
5. Phloem follows positive pressure and moves towards the sink (root system).
6. Sugar is stored in the sink.
7. Cells use the sugar for cellular respiration.
8. Water exits by osmosis and returns to the xylem.
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Removal of which of the following lymphoid organs would be most detrimental to immune function in an infant?
What will be an ideal response?
All of the following are true of outbreaks with
Escherichia coli O157:H7 cells EXCEPT a. strong economic impacts b. fear in consumers c. thousands of deaths d. intestinal infection in some people e. not a cause of disease in cows
During convergent extension,
A) cells on the opposite side of the embryo follow converging developmental pathways leading to bilateral symmetry. B) the cells of the neural folds adhere to one another to complete the neural tube. C) the cells of a tissue layer reorganize, forming a narrowed, elongated sheet. D) the dorsal-ventral axis is established. E) cell adhesion molecules are expressed, causing the eight blastomeres to adhere tightly to one another.
Which of these is a pigment located within the thylakoid membrane that functions to capture solar energy?
a. Nucleoplasm b. Matrix c. Chlorophyll d. Stroma e. Cytoplasm