Ultrastructure Of Cells Flashcards
1
Q
What type of DNA as introns?
A
Eukaryotic DNA
2
Q
What is binary fission?
A
The circular DNA is copied in response to a replication signal
The two DNA loops attach to the membrane
The membrane elongates and pinches off (cytokinesis), forming two cells
3
Q
What are the advantages of compartmentalization in eukaryotic cells?
A
increased efficiency of metabolism (enzymes & substrates are enclosed = more concentrated)
Internal conditions (pH) can be differentiated for optimal conditions
Isolation of toxic or damaging substances away from the cytoplasm
4
Q
What is a plasmodesmata?
A
a narrow thread of cytoplasm that passes through the cell walls of adjacent plant cells and allows communication between them.
5
Q
What seals tight junctions?
A
Rows of transmembrane proteins
