Question 1

A cortical cell and a mesophyll cell from the same plant most likely have different genes in their nuclei.

Accepted Answer

Both cortical and mesophyll cells in a plant have the same genetic material in their nuclei, but they may express different genes depending on their function.

Question 2

Expansins are proteins that disrupt hydrogen bonds between cell wall polysaccharides.

Accepted Answer

Expansins are proteins that facilitate cell wall loosening by disrupting hydrogen bonds between cellulose microfibrils and other polysaccharides, allowing for cell expansion.

Question 3

Based on the results of experiments with cultured mesophyll cells of Zinnia elegans, you would predict that if brassinosteroids were excluded from the culture medium, no tracheary elements would be formed.

Accepted Answer

Brassinosteroids are essential for the formation of tracheary elements in Zinnia elegans.

Question 4

Second messengers do not cross the plasma membrane and enter the cytosol.

Accepted Answer

Second messengers are molecules that relay signals received at receptors on the cell surface to target molecules inside the cell, often in the cytosol, and they can cross the plasma membrane to perform their function.

Question 5

In Arabidopsis, the ethylene receptor is located in the plasma membrane.

Accepted Answer

The ethylene receptor in Arabidopsis is located in the endoplasmic reticulum membrane, not the plasma membrane.

Quiz 27: Regulating Growth and Development: the Plant Hormones

A cortical cell and a mesophyll cell from the same plant most likely have different genes in their nuclei.

Expansins are proteins that disrupt hydrogen bonds between cell wall polysaccharides.

Based on the results of experiments with cultured mesophyll cells of Zinnia elegans, you would predict that if brassinosteroids were excluded from the culture medium, no tracheary elements would be formed.

Second messengers do not cross the plasma membrane and enter the cytosol.

In Arabidopsis, the ethylene receptor is located in the plasma membrane.