#Question id: 5656
#Unit 5. Developmental Biology
What is the cortical reaction, and why is it important?
#Question id: 9613
#Unit 9. Diversity of Life Forms
Which of the following pairs are the best examples of homologous structures?
#Question id: 7280
#Unit 5. Developmental Biology
In
drosophila, Physical forces drive invagination of the ventral furrow. Following
statements regarding to this process:
A. The cellularized blastoderm will begin
to activate higher levels of myosin in the cells at the ventral midline and
preferentially at their apical surface.
B. Epithelial adhesions paired with
differential activation of dynein and tissue geometry create mechanical
constraints that affect the orientation of actomyosin meshworks.
C. The A/P oriented arrays of myosin in the
cells at the ventral midline generate tension along the anterior-posterior
axis.
D. The combination of tissue geometry and
tension of these anterior-to-posterior meshworks cause the tissue to fold
outward at a right angle to the anterior-posterior axis, creating a long and
narrow ventral furrow.
Which of the following statements are incorrect?
#Question id: 11073
#Unit 7. System Physiology – Animal
The respiratory passageways have smooth muscle in their walls. Which of the following best describes the effect of acetylcholine and epinephrine on the respiratory passageways?
#Question id: 24235
#Unit 4. Cell Communication and Cell Signaling