#Question id: 24260
#Unit 2. Cellular Organization
#Question id: 1084
#Unit 4. Cell Communication and Cell Signaling
Which observation suggested to Sutherland the involvement of a second messenger in epinephrine's effect on liver cells?
#Question id: 5673
#Unit 5. Developmental Biology
Species-specific sperm attraction has been documented in numerous species. In echinoderms, sperm are attracted toward eggs of their species by chemotaxis. Following statements are about chemoattraction-
A. In this process Sperm follows a gradient of a chemical secreted by the egg.
B. These oocytes control only the type of sperm they attract, but not the time at which they attract them.
C. Releasing the chemotactic factor only when the sea urchin egg has completed all of its meiotic divisions .
D. Releasing the chemotactic factor only when the sea urchin egg is in second metaphase of its meiotic division.
E. The mechanisms of chemotaxis differ among species and chemotactic molecules are different even in closely related species.
Which of the following statement are incorrect about this process?
#Question id: 21250
#Unit 7. System Physiology – Animal
#Question id: 10555
#Unit 6. System Physiology – Plant
The water molecule, hydrogen–oxygen bonds form an angle of 105°, The opposite partial charges (δ– and δ+) on the water molecule lead to the formation of which bond with other water molecules,