Note: To use this page as intended your browser must be JavaScript enabled.

Click on the question buttons (left) to navigate to the questions, type your answer in the text area provided below each question and then click the submit button (your answer will then appear below the text area). After answering a question, click on the answer button to view a sample answer. Compare your answer to the sample answer. If your answer is significantly different, I suggest you examine how you arrived at your answer. Instructions for saving this page with your responses.

Hyphal Structure Questions

Question 1

Submit Answer 1

Answer 1

A single thallus will consist, at most, of somatic, generative and survival hyphae.

Top

Question 2

Submit Answer 2

Answer 2

Adventitious or secondary septa form in all filamentous fungi. In principle, the secondary septa enable separation of function within the thallus. They cut off dead parts of the thallus, thus preventing the loss of cytoplasm. They also separate spore forming structures from the rest of the thallus.

Top

Question 3

Submit Answer 3

Answer 3

It is thought that cytoplasm moves either in vacuolar tubules, or through differences in osmotic pressure.

Top

Question 4

Submit Answer 4

Answer 4

The thallus can become divided by secondary septa, which prevent movement of cytoplasm between the component parts. A single thallus can thus become divided into several parts with different functions in each.

Top

Question 5

Submit Answer 5

Answer 5

The potential of a yeast cell to divide is limited to the surface area free of scars. Once the surface is covered by scars the cell is unable to divide further.

Top

Question 6

Submit Answer 6

Answer 6

Turgor pressure within the cell provides the pressure to ensure expansion. Selective release of enzymes at the tip ensures turgor pressure is effective only in expanding controlled areas of the cell wall. As the tip is dissolved, the cytoskeleton moves wall elements into the region. The elements are laid down over the expanding region. The filamentous form is sustained by complete control over movement of component parts, turgor and digestion.

Top

Question 7

Submit Answer 7

Answer 7

Some groups of Basidiomycetous fungi form different types of hyphae which are found in characteristic locations in complex structures. The most common type, called generative, have a typical morphology. They may be supported by skeletal hyphae which are thick walled and lack septa. Both types of hyphae may be bound together by binding hyphae, which are also thick walled, but are also highly branched.

Top