#Question id: 24599
#Unit 2. Cellular Organization
Polytene chromosomes are produced by
#Question id: 9171
#Unit 9. Diversity of Life Forms
Suppose that the number of bird species is determined mainly by the number of vertical strata found in the environment. If so, in which of the following biomes would you find the greatest number of bird species?
#Question id: 5671
#Unit 5. Developmental Biology
Match the following mechanism of polyspermy (Column I) with events (Column II).
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Column I |
Column II |
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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: 12069
#Unit 7. System Physiology – Animal
#Question id: 4176
#Unit 3. Fundamental Processes
The unambiguity and degeneracy of the genetic code can best be respectively exemplified by which of the following?