#Question id: 16967
#Unit 11. Evolution and Behavior
#Question id: 12432
#Unit 10. Ecological Principles
#Question id: 4539
#Unit 3. Fundamental Processes
The yeast S. cerevisiae exists in three forms: two haploid cells of different mating types—a and alpha and the diploid formed when an a and an a cell mate and fuse. The a cell and the a cell each encodes cell-type-specific regulators: a cells make the regulatory protein a1, and alpha cells make the proteins alpha1 and alpha2. A fourth regulatory protein, called Mcm1, is also involved in regulating the mating-type-specific genes (and many other genes) and is present in both cell types which shows Combinatorial Control.
The arrangement of regulators at the promoters of a-specific genes and a-specific genes is
|
cell type: |
gene regulatory proteins: |
target genes: |
|
1.a cell (haploid) |
a1 Mcm1 |
aSG alphaSG |
|
2.αlpha cell (haploid) |
alpha 1 alpha 2 Mcm2 |
hSG |
|
3.a/αlpha cell (diploid) |
a1 Mcm2 alpha2 |
#Question id: 12186
#Unit 2. Cellular Organization
#Question id: 10715
#Unit 10. Ecological Principles
Following table shows the presence (+) or absence (-) of five species in three communities (A, B, C):
Based on the above, which of the following is the correct order of diversity strength communities?