A variety of proteins link actin to membranes. A ________ protein is used to link actin to the ________ membrane.
A) linker; plasma
B) spectrin; ER
C) ankyrin; lysosome
D) band 4.1; basal
E) band 4.1; mucous
A) linker; plasma
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Proteins called transcription factors are involved in ____ of transcription
a. both initiation and termination stages b. both initiation and elongation stages c. the termination stage d. the initiation stage e. the initiation, elongation, and termination stages
A keystone species has a greater effect on community structure than its numbers might suggest
Indicate whether the statement is true or false.
The number of species of living organisms on the planet is probably closest to
A) 100,000. B) 1,000,000. C) 10,000,000. D) 100,000,000.
From what substance do liposomes spontaneously form and why are they important?
a. Liposomes spontaneously form from DNA and proteins and provide a rigid structure to support the cell. b. They are formed from phospholipid monolayers. These phospholipid monolayers provide a stable barrier between the internal and external environments. c. Liposomes were the first rigid cell walls providing support for the living cell and a barrier between the external and internal environments. d. Liposomes form from phospholipid bilayers and provide a barrier between an external environment and an internal environment; this creates an internal environment where specific chemical reactions needed to establish a living cell can occur separately from the external environment.