#Question id: 28877
#Unit 4. Cell Communication and Cell Signaling
O-acetyltransferase Porcupine is an enzyme which catalyzes?
#Question id: 212
#Unit 1. Molecules and their Interaction Relevant to Biology
Which functional group is shown below?
#Question id: 18605
#Unit 13. Methods in Biology
#Question id: 5671
#Unit 5. Developmental Biology
Match the following mechanism of polyspermy (Column I) with events (Column II).
|
Column I |
Column II |
|
A. Fast block to polyspermy |
i. chemicals from the fusing sperm cytoplasm alter the sodium ion (Na+) channels on the membrane |
|
B. Slow block to polyspermy |
ii. enzyme cortical granule serine protease, cleaves the protein posts that connect the vitelline envelope |
|
iii the concentration of free Ca2+ in the egg cytoplasm increases |
|
|
iv. an electric change in the egg cell membrane |
|
|
v. the concentration of free Na+ in the egg cytoplasm increases |
Which of the following is correct?
#Question id: 2526
#Unit 2. Cellular Organization
cell walls essential and are important features of plant cells that perform a number of essential functions. Which of the following is not the characteristics of cell wall?