Lecture 19 Basiodomycetes

Question 1

How to basidiomycetes mate

Answer 1

To be able to mate, strains must differ at mating type loci A and loci B (one strain has A1 and B1, other strain has A2 and B2). A dikaryotic mycelium is formed

Question 2

What are clamp connections

Answer 2

Clamp connection assure that, as a dikaryotic hyphae extends, new parts of the hyphae contain both nuclei

Question 3

What is an ascus (Ascomycetes)

Answer 3

A cylindrical sac in which spores of ascomycete fungi develop. Ascus’ contain 8 ascospores

Question 4

What are the 3 ascocarps (multiple asci arranged in larger structures)

Answer 4

Apothecium (high dispersal low protection)
Perithecium (average dispersal and protection)
Cleistothecium (low dispersal high protection)

Question 5

How does Saccharomyces cerevisiae change its mating type?

Answer 5

Three regulatory proteins encoded by the
Saccharomyces cerevisiae mating type locus
determine cell type by regulating the expression of
other genes

Question 6

What is a primary metabolite and give an example

Answer 6

A primary metabolite is made during and as part of growth and an example is ethanol in Saccharomyces Cerevisiae

Question 7

What is a secondary metabolite and give an example

Answer 7

A secondary metabolite is made after growth and an example is penicillin in penicilium