#Question id: 12170
#Unit 8. Inheritance Biology
#Question id: 1305
#Unit 4. Cell Communication and Cell Signaling
Ions can travel directly from the cytoplasm of one animal cell to the cytoplasm of an adjacent cell through:
#Question id: 7219
#Unit 5. Developmental Biology
Following statements are regarding to the role of the Disheveled and β-catenin proteins in specifying the cells of the sea urchin embryo.
A. During normal development, β-catenin accumulates predominantly in the micromeres and somewhat less in the veg2 tier cells.
B. In embryos treated with lithium chloride, β-catenin accumulates in the nuclei of all blastula cells and the cells of the animal pole become specified as ectoderm.
C. When β-catenin is prevented from entering the nuclei (i.e., it remains in the cytoplasm), the vegetal cell fates are not specified, and the entire embryo develops as a ciliated ectodermal ball.
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 specified as endoderm and mesoderm .
Which of the following statements are true?
#Question id: 8851
#Unit 9. Diversity of Life Forms
Why is territoriality an adaptive behavior for songbirds maintaining populations at or near their carrying capacity?
#Question id: 11201
#Unit 7. System Physiology – Animal
Why are action potentials usually conducted in one direction?