#Question id: 19085
#Unit 4. Cell Communication and Cell Signaling
#Question id: 15195
#Unit 8. Inheritance Biology
#Question id: 7272
#Unit 5. Developmental Biology
Few statements regarding the role of disheveled (dsh) and beta-catenin in the
development of sea urchin.
A.
beta-catenin accumulates predominantly in the macromeres and somewhat in veg2
tier cells.
B.
At the fourth cleavage disheveled and β-catenin, both of which are found in the
cytoplasm and are inherited by the micromeres.
C.
Treating sea urchin embryos with lithium chloride allows β-catenin to
accumulate in every cell and transforms presumptive ectoderm into endoderm.
D.
When β-catenin is prevented from entering the nuclei (i.e., it remains in the
cytoplasm), the vegetal cell fates are specified, and the entire embryo
develops as a ciliated ectodermal ball.
Which one of the following options represents a combination of correct statement?
#Question id: 11714
#Unit 10. Ecological Principles
In recognizing patchiness in the natural world, ecologists have developed three different models of populations. Which of these recognize(s) that there are differences in the quality of habitat patches without considering effects of differences in habitat quality within the habitat matrix?
#Question id: 2827
#Unit 2. Cellular Organization
Two related genes that are derived from a gene duplication event are considered to be
a. homologous.
b. paralogous.
c. orthologous.
d. members of a gene family.