What causes the formation of a polyribosome in prokaryotic transcription?
a. initiation of transcription and the formation of the transcription bubble
b. termination of transcription when polymerase stalls in the A-T-rich regions
c. multiple instances of translation on the same mRNA
d. binding of polymerase to the promoter region
c. multiple instances of translation on the same mRNA
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Structural and functional organization emerges
during the __________ and __________ of an individual. Fill in the blank(s) with the appropriate word(s).
Which of the following short descriptions best describes the body plan of modern sponges?
a. an aggregation of cells built around a water canal system b. a complete gut with an anterior mouth and posterior anus c. a complete gut with one opening serving as both mouth and anus d. a mouth connected to a blind sac in which digestion occurs e. an aggregation of cells in a random arrangement
In a typical human secretory cell, which of the following membranes has the largest surface area?
A.) lysosomes B.) plasma membrane C.) smooth ER D.) rough ER E.) nuclear inner membrane
Insulin's affect on reducing blood glucose levels are counteracted by glucagon's actions, which increase blood glucose.
Answer the following statement true (T) or false (F)