#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: 4716
#Unit 11. Evolution and Behavior
Which of the following is correct match?
A |
Wallace |
I |
Changes in allele frequency due to random genetic drift |
B |
Sewall Wright |
II |
Evolution by natural selection |
C |
Carl Woese |
III |
hybrid sterility |
D |
Haldane’s rule |
IV |
DNA sequencing led to molecular phylogenetics |
#Question id: 2166
#Unit 2. Cellular Organization
Typical ion/ligand concentrations are
#Question id: 24654
#Unit 2. Cellular Organization
Which of the following is not an example of an ion transporter?
#Question id: 12582
#Unit 10. Ecological Principles