Membrane proteins serve many functions. One of the functions is transportation of substances across the membrane. If a cell biologist placed cells into an environment in which a chemical has been added that blocks the function of only carrier proteins, the process that will be affected is
A. active transport.
B. osmosis.
C. simple diffusion.
D. phagocytosis.
E. pinocytosis.
A. active transport.
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Which of the following is required for formation of the open complex of replication initiation?
A. binding of DnaB helicase to single strands of the replication bubble B. binding of DnaC to the four 9-mer consensus sequences, which destabilizes the AT-rich repeat sequences C. binding of DnaA to the four 9-mer consensus sequences, which destabilizes the AT-rich repeat sequences D. DnaA/DnaC/ATP complex loads DnaA onto the origin and ATP hydrolysis allows release of the DnaC protein E. oligomerization of the HU protein upon binding the origin, and wraping of the DNA around the oligomer
Once human nerve cells become mature, they normally exit the cell cycle and remain in ____
a. G0 b. G1 c. G2 d. S phase e. prophase
The plasma membrane regulates the passage of all raw materials, waste, and energy sources into and out of the cell
a. true b. false
What is facilitated diffusion
What will be an ideal response?