In DNA, the 300 Å fiber is formed into structural loops. Responsibility for this function appears to lie with
A) histone H4.
B) nucleosomase.
C) histone H1.
D) certain nonhistone proteins.
E) remodeling complexes.
D) certain nonhistone proteins.
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What do MOST halobacteria use for carbon substrates?
A) amino and organic acids B) carbohydrates C) lipids D) nucleic acids
To see if a growth-promoting factor was released from blood platelets, cells called fibroblasts were placed in a dish containing liquid cell culture medium
The medium was supplemented with either serum (collected from blood that had been allowed to clot) or plasma from blood in which the platelets had not been activated during the clotting process. The number of cells in each culture is shown in the graph. Reference: Ref 9-2 How many cells are there on Day 3 in the culture that contains serum? A. 80,000 B. 800,000 C. 40,000 D. 400,000
cAMP activates
A) protein kinase A. B) protein kinase B. C) protein kinase C. D) protein kinase G. E) MAPK.
The process of generating ATP using a proton gradient is referred to as
a. water damming. b. chemiosmosis. c. the electron transport chain.