#Question id: 7264
#Unit 5. Developmental Biology
The Dictyostelia social
amoebas are found in a wide range of soil habitats. They can come together to
form a fruiting structure, in which a proportion of cells are sacrificed to
build the stalk and the remainder differentiate into resilient dormant spores.
This multicellular life cycle is common to all Dictyostelids. It consists
of an interconnected programme of cell movement and cell differentiation, and
has been intensively studied in the model organism D. discoideum. Few mutants
(Column A) and phenotypes (Column B) are listed in the table given below.
|
Column A |
Column B |
|
A.
Loss of function of cAMP-dependent
protein kinase (PKA) |
i.
cell develop normally but unable to germinate |
|
B.
Loss of function of RegA |
ii.
Loose aggregate form |
|
C.
Loss of function of adenylate cyclase B |
iii.
No aggregation |
|
D.
Loss of function of gp80 |
iv.
accumulation of cAMP and PKA activation |
#Question id: 33328
#Unit 2. Cellular Organization
#Question id: 12620
#Unit 10. Ecological Principles
#Question id: 2548
#Unit 2. Cellular Organization
The cell walls of bacteria, fungi, and plant cells, and the extracellular matrix of animal cells are all external to the plasma membrane. Which of the following characteristics are common to all of these extracellular structures?
#Question id: 32925
#Unit 2. Cellular Organization