Chlorophyll is comprised of a central ________ containing a(n) ________ ion and a(n) ________ side chain.
Fill in the blank(s) with the appropriate word(s).
porphyrin ring; Mg, phytol
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Which of the following is not true about the role of Mediator complex in transcription initiation?
A. Mediator binds to RNA polymerase II. B. Mediator binds to upstream enhancer sequences. C. Mediator binds to general transcription factors. D. Mediator binds to transcription activators. E. Mediator increases the rate of the assembly of the preinitiation complex.
This layer of the eye contains melanin and arteries that provide other parts with nutrients and oxygen
A) iris B) retina C) choroid D) sclera
The release of chemicals from injured cells triggers histamine release from
A) macrophages.
B) B cells.
C) neutrophils.
D) phagocytes.
E) mast cells.
Which of the following is TRUE about the cholesterol associated with membranes?
a) it makes the cell membrane fluid at room temperature b) it is oriented with the small hydroxyl group embedded in the lipid bilayer and the remainder of the molecule toward the membrane surface c) it interferes with the movements of fatty acid tails of the phospholipids d) all of the choices are correct