How do plants form primary cell walls?
What will be an ideal response?
In plants, the cell wall forms as a young cell secretes pectin and other polysaccharides onto the outer surface of its plasma membrane. The sticky coating is shared between adjacent cells, and it cements them together. Each cell then forms a primary wall by secreting strands of cellulose into the coating. Some of the pectin coating remains as the middle lamella, a sticky layer in between the primary walls of abutting plant cells.
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Which of the following behaviors is associated with a high risk of HIV transmission?
a. unprotected sex (no condom used) b. hugging c. casual kissing d. sharing bathroom facilities e. sharing food or water
Which of the following may occupy more than 90% of a mature plant cell's volume?
a. chromoplasts b. the rough endoplasmic reticulum c. the central vacuole d. the nucleus
Inability of the pancreas to produce insulin will result in
The optimal percent body fat for men is estimated to be:
What will be an ideal response?